高考英语单项填空分类详解(状语从句)
　　81. ?Where’s that report?
　　?I brought it to you __________ you were in Mr. Black’s office yesterday. (2007北京卷)
　　A. if　　　　　　　　　　　　B. when
　　C. because　　　　　　　 D. before
　　82. Leave your key with a neighbor __________ you lock yourself out one day. (2007北京卷)
　　A. ever since　　　　　　B. even if
　　C. soon after　　　　　　D. in case
　　83. You will be successful in the interview __________ you have confidence. (2007福建卷)
　　A. before　　　　　　　　 B. once
　　C. until　　　　　　　　　　D. though
　　84. Most birds find it safe to sleep in the trees, but __________ they have eggs or young chicks, they don’t use a nest. (2007湖南卷)
　　A. why　　　　　　　　　　B. how
　　C. unless　　　　　　　　　D. where
　　85. He was told that it would be at least three more months __________ he could recover and return to work. (2007江西卷)
　　A. when　　　　　　　　　 B. before
　　C. since　　　　　　　　　　D. that
　　86. I won’t call you, __________ something unexpected happens. (2007全国I)
　　A. unless　　　　　　　　　 B. whether
　　C. because　　　　　　　　 D. while
　　87. __________ he had not hurt his leg, John would have won the race. (2007全国II)
　　A. If　　　　　　　　　　　　　B. Since
　　C. Though　　　　　　　　　D. When
　　88. __________ I really don’t like art, I find his work impressive. (2007山东卷)
　　A. As　　　　　　　　　　　　 B. Since
　　C. If　　　　　　　　　　　　　 D. While
　　89. It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson. (2007天津卷)
　　A. until　　　　　　　　　　　 B. after
　　C. since　　　　　　　　　　　D. when
　　90. Many of them turned a deaf ear to his advice, __________ they knew it to be valuable. (2007浙江卷)
　　A. as if　　　　　　　　　　　 B. now that
　　C. even though　　　　　　D. so that
　　91. My parents live in a small village. They always keep candles in the house __________ there is a power cut. (2007重庆卷)
　　A. if　　　　　　　　　　　　　　B. unless
　　C. in case　　　　　　　　　　D. so that
　　92. ?Do you have a minute? I’ve got something to tell you.
　　?Ok, _________ you make it short. (2008安徽卷)
　　A. now that　　　　　　　　 B. if only
　　C. so long as　　　　　　　 D. every time
　　93. ?Did you return Fred’s call?
　　?I didn’t need to _________ I’ll see him tomorrow. (2008北京卷)
　　A. though　　　　　　　　　　B. unless
　　C. when　　　　　　　　　　　D. because
　　94. I’m sorry you’ve been waiting so long, but it’ll still be some time _________ Brian gets back. (2008北京卷)
　　A. before　　　　　　　　　　 B. since
　　C. till　　　　　　　　　　　　　 D. after
　　95. Nancy enjoyed herself so much _________ she visited her friends in Sydney last year. (2008福建卷)
　　A. that　　　　　　　　　　　　 B. which
　　C. when　　　　　　　　　　　 D. where
    详解：
　　83. B。once的意思是“一旦”，又如：Once you have taken this decision, there will be no going back, ie you will not be able to change your mind. 一旦作出这个决定，你就不能改变主意。Once you understand this rule, you’ll have no further difficulty. 一旦明白了这条规则，就再也没有困难了。
　　84. C。将四个选项的意思分别套入句中，只有填unless时意思最通顺。为便于理解，句子也可转换成：Most birds find it safe to sleep in the trees, but they don’t use a nest unless they have eggs or young chicks.
　　85. B。it was some time before…是一个很有用的句型，其字面意思是“在……之前过了一段时间”，通常可转译为“要过一段时间才会……”，如：It will be five years before we meet again. 五年以后再见。It may be a matter of months before it’s ready. 要准备好可能得数月时间。
　　86. A。unless的意思是“除非”，又如：Don’t call me unless you need help. 除非你需要帮助否则别打电话找我。Unless you change your mind, I won’t be able to help you. 除非你改变你的想法，否则我不能帮助你。
　　87. A。if在此引出一个虚拟条件。又如：If he had asked me, I would have had to tell him the truth. 如果他问我，我就不得不告诉他真相了。If I had not got married, I would still have been living abroad, 如果我没结婚，我就会仍然住在国外。
　　88. D。while在此表示“尽管”“虽然”，又如：While the work was difficult, it was interesting. 尽管工作有难度，但很有趣。/ While I understand what you say, I can’t agree with you. 虽然我理解你的意思，但我还是不同意。
　　89. A。until的意思是“直到……时”“在……之前”，如：We always have to wait until the last customer has left. 我们总得等着最后一位顾客离去。
　　90. C。as if意为“好像”“似乎”，now that意为“既然”，even though意为“尽管”“虽然”，so that意为“为了”。比较四个选项，只有选C最合适。
　　91. C。in case意为“以防万一”，又如：I bought the car at once in case he changed his mind. 我马上买下了那辆汽车，以免他变卦。I don’t let him climb trees in case he tears his trousers. 我不让他爬树，以免撕破裤子。
　　92. C。比较：now that意为“既然”；if only意为“只有”；so long as意为“只要”；every time意为“每次”。分别代入句中，只有填as long as时，意思最通顺。
　　93. D。根据句意思，只有填because意思最通顺。
　　94. A。根据句意，只有填before时意思最通顺。It’ll be some time before…是英语中一个很有用的句式，其意为“要过一段时间才……”，如：It’ll be some time before we meet again. 要过一段时间我们才能见面。有时也可用其他时态，如：It was some time before we struck the track. 我们用了很长时间才找到了路。
　　95. C。本题很容易让考生受思维定势的负面影响，见到so马上选择that，殊不知此题考查的是when引导的时间状语从句，句意为：南希去年拜访悉尼的朋友时过得非常开心。如果选A，则句意为：南希玩得如此开心以至于拜访了悉尼的几个朋友。显然，意思不合逻辑。

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