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Sorry,Cathy,I didn’t know that you were badly short of money then.But you ________ me for help.
A.must have asked
B.could have asked
C.would have asked
D.may have asked
B
解析 考查情态动词。说话人为自己不知道Cathy当时急需用钱而感到抱歉,认为Cathy当时本来可以向自己求助。could have done表示过去本来可以做某事,可实际上并没有做。
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