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

A. what B. whom

C. why D. 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。

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