1.Is this the factory which / that you visited yesterday?
　　还原为陈述句：This is the factory which / that you visited yesterday.
　　2. 是许多年以前我在华盛顿遇见过布莱克先生。
　　It was many years ago that I met Mr. Black in Washington.
　　还原为基本结构：Many years ago I met Mr. Black in Washington.
　　3. 湖如此浅以致于里面没有鱼。
　　So shallow is the lake that no fish can live in it.
　　还原为正常语序：The lake is so shallow that no fish can live in it.

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