Question

4. [2014 •浙江卷]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

4.    A考查虚拟语气。句意：当我们在做调查的那几个月里，他们一直在国外，否则的话他们早就来帮我们了。从句中的关键题眼or可知，此处是虚拟语气，同时根据前面的they were abroad可知，此处是对过去状况的虚拟，根据语法规则可知， 句中谓语动词用"should/would/could/might + have done"结构，所以选A项。