【題目】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】

試題分析：這里when引導的是定語從句，修飾前面的名詞months;根據(jù)謂語動詞were可知事情發(fā)生過去，or后是對過去的虛擬，所以應(yīng)該用would have done，故選A。句意：在我們進行調(diào)查期間他們在國外，要不然的話他們就來幫忙。

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