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    【题目】They were abroad during the months when we were carrying out the investigation, or they _____ toour help.

    A. would have come B. could come

    C. have come D. had come

    【答案】A

    【解析】

    试题分析：这里when引导的是定语从句，修饰前面的名词months;根据谓语动词were可知事情发生过去，or后是对过去的虚拟，所以应该用would have done，故选A。句意：在我们进行调查期间他们在国外，要不然的话他们就来帮忙。

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