[题目]A ship in harbor is safe, but that's not ships are built for.A.whatB.whomC.whyD.when 题目和参考答案——青夏教育精英家教网—

【题目】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，但这并非建造船的目的，isn't后跟从句作表语，表语从句中的for后缺少宾语，用what引导，what与for连用，表示目的，故选A

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