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

单项选择题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：
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