A ship in harbor is safe, but that’s not ______ ships are built for. ( 章节：1 难度：2)_做题室

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A ship in harbor is safe, but that’s not ______ ships are built for. ( 章节：1 难度：2)

A、what
B、whom
C、why
D、when

正确答案:A

答案解析:有

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