Theywereabroadduringthemonthswhenwewerecarryingoutthein...

问题详情：

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

【回答】

A

知识点：虚拟语气与情态动词

题型：选择题