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

試題分析：這里when引導(dǎo)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(jìn)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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