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

A. whatB. whomC. whyD. when

【答案】A

【解析】

試題分析：句意：船停放在海港里是很安全的，但這并非建造船的目的。isn’t后跟從句作表語，表語從句中的for后缺少賓語，用what引導，what與for連用，表示目的。故選A。本題考查表語從句。isn’t后跟從句作表語，what在名詞性從句中作主語、賓語或表語；why和when作狀語。介詞for后缺少賓語，因此用what。

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