Question

【题目】

They were abroad during the months when we were carrying out the investigation, or they _____ to our help.

A.would have come B. could come

C. have come D. had come

Answer 1

【答案】A

【解析】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。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。