高考英语单项填空分类详解(情态动词)
61. The teacher __________ have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose. (2007安徽卷)
A. should B. can
C. would D. must
62. In crowded places like airports and railway stations, you __________ take care of your luggage. (2007北京卷)
A. can B. may
C. must D. will
63. My MP4 player isn’t in my bag. Where __________ I have put it? (2007福建卷)
A. can B. must
C. should D. would
64. The biggest problem for most plants, which ___ just get up and run away when threatened, is that animals like to eat them. (2007湖南卷)
A. shan’t B. can’t
C. needn’t D. mustn’t
65. — She looks very happy. She __________ have passed the exam.
— I guess so. It’s not difficult after all. (2007江苏卷)
A. should B. could
C. must D. might
66. —Where is my dictionary? I remember I put it here yesterday.
—You __________ it in the wrong place. (2007江西卷)
A. must put B. should have put
C. might put D. might have put
67. —How’s your tour around the North Lake? Is it beautiful?
—It __________ be, but it is now heavily polluted. (2007全国I)
A. will B. would
C. should D. must
68. I told your friend how to get to the hotel, but perhaps I __________ have driven her there. (2007陕西卷)
A. could B. must
C. might D. should
69. — What does the sign over there read?
—“No person __________ smoke or carry a lighted cigarette，cigar or pipe in this area.” (2007四川卷)
A. will B. may
C. shall D. must
70. — My cat’s really fat.
— You __________ have given her so much food. (2007浙江卷)
A. wouldn’t B. couldn’t
C. shouldn’t D. mustn’t
71. —What do you think we can do for our aged parents?
—You __________ do anything except to be with them and be yourself. (2007重庆卷)
A. don’t have to B. oughtn’t to
C. mustn’t D. can’t
72. It is usually warm in my hometown in March, but it _________ be rather cold sometimes. (2008福建卷)
A.must B. can
C. should D. would
73. You don’t have to know the name of the author to find a book. You _________ find the book by the title. (2008湖南卷)
A.must B. need
C. can D. would
74. —I’m sorry. I _________ at you the other day.
—Forget it. I was a bit out of control myself. (2008江苏卷)
A. shouldn’t shout B. shouldn’t have shouted
C. mustn’t shout D. mustn’t have shouted
75. What a pity. Considering his ability and experience, he _________ better. (2008江西卷)
A. need have done B. must have done
C. can have done D. might have done
详解：
61. D。“must+have+过去分词”表示对过去情况的肯定推测。句意为：我想，老师一定认为约翰逊是值得教的，要不然她就不会在他身上浪费时间了。
62. C。must在此表示“必须”。句意为：在像机场和火车站这样的比较拥挤的地方，你必须要看好自己的行李。
63. A。can在此表推测，“can+have+过去分词”表示对过去情况的推测，主要用于否定式或疑问句中。句意为：我的MP4不在包里，我会把它放到哪里去了呢？
64. B。can在此表示能力，can’t表示“不能”。此题所考查的知识点比较简单，但由于句子结构比较复杂，所以许多学生不是由于没有弄清知识点而误选，而是由于不理解句意而误选。全句意为：对于大多数植物来说，它们所面临的最大问题是(有些)动物喜欢以它们为食物，而当它们受到威胁时却不能起身逃跑。
65. C。“must+have+过去分词”表示对过去情况的肯定推测。由于“她看上去气色不错”，而且“考试也不难”，所以她一定是通过了考试。
66. D。根据I remember I put it here yesterday可知，put用的是一般过去时，也就是说空格处是对过去情况作推测，故可排除A和C。再根据should have put(本来应该放在)和might have put(可能已放在)的不同意思和句子语境可知，此题应选D不能选B。
67. C。it should be后承前省略了beautiful一词，即指应该是很美的，但由于受到了严重的污染，所以不美了。
68. D。比较：“could+have+过去分词”的意思是“本来可以”“本来应该”“本来能够”; “must+have+过去分词”的意思是“一定已经”; “might+have+过去分词”的意思是“本来可以”“本来可能”; “should+have+过去分词”的意思是“本来应该”。根据句意，显然只有D最佳。
69. C。shall在陈述句中用于第二人称和第三人称时，可表示说话者的允诺、告诫、威胁、命令、规定、必然性等，如：You shall suffer for this. 你会为此事吃苦头的。(表威胁) Tell him that he shall have the book tomorrow. 告诉他这本书明天给他。(表允诺) Persons under 18 shall not be employed in night work．不满18岁的人不得雇佣干夜间工作。(表规定)
70. C。shouldn’t have done的意思是“本来不应该做某事”。
71. A。don’t have to意为“不必”。句意是：你不必做什么，只需陪陪他们，真诚地对待他们。
72. B。can表示推测时通常只用于否定句或疑问句，很少用于肯定句。但有两种情况是例外（即可用于肯定句）：一是表示纯理论上的可能性，二是表示“有时”，如：Even experienced teachers can make mistakes. 即使是有经验的教师也可能出错。She can be very unpleasant. 她有时很令人讨厌。
73. C。比较四个选项的意思，并分别代入句中，只有C最符合语境。
74. B。由于must表示推测时通常不用于否定句，所以可排除C和D；再根据句中的the other day（几天前）可知，此处谈的是过去的情况，故要用“情态动词+完成式”，即答案移过B。
75. D。根据语法规则可知A和C不对，因为need和can用作情态动词时通常只用于否定句或疑问句，不用于肯定句；再根据句意，选D最佳。句意为：真是遗憾！考虑到他的能力和经验，他本来可以做得更好的。
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