問題補(bǔ)充：
單選題
Mary ______ my letter; otherwise she would have replied before now.A.has receivedB.ought to have receivedC.couldn’t have receivedD.shouldn’t have received
網(wǎng)友答案：
熱心網(wǎng)友 1樓
C解析考查情態(tài)動詞用法。關(guān)鍵后半句：要不然，她之前就會給我回信。根據(jù)這里的would have replied可知是對過去情況的虛擬，那么前一句也應(yīng)該是對過去情況的推測。結(jié)合句意可知C正確。句意：瑪麗不可能收到我的信得。要不然之前就會給我回信的。
