摘要： Mary my letter; otherwise she would have replied before now. A. has received B. ought to have received C. couldn’t have received D. shouldn’t have received 解析:C．注意单词otherwise引导虚拟语气.
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Mary__________my letter;otherwise she would have replied before now.?
A.has received? B.ought to have received?
C.couldn’t have received? D.shouldn’t have received?
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