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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　考查情態(tài)動詞。說話人為自己不知道Cathy當時急需用錢而感到抱歉，認為Cathy當時本來可以向自己求助。could have done表示過去本來可以做某事，可實際上并沒有做。
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