【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】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(dǎo),what與for連用,表示目的,故選A

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