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They were abroad during the months when we were carrying out the investigation, or they _____ to our help.
A.would have comeB.could comeC.have comeD.had come
A

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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