【題目】A ship in harbor is safe,but that's not ships are built for.

A. which B. where

C. what D. why

【答案】C

【解析】句意：港口的船是安全的，但是這不是建輪船的目的。這里是表語從句，表語從句中for缺少賓語，用what連接表語從句，that連接表語從句的時候，不做成分，why為什么，how怎么，所以選A。

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