问题补充:
单选题Wethepostcardsyesterday,butitdidn’tarrive.A.should receiveB.ought to receiveC.ought to have receivedD.must have received
答案:
C解析考查虚拟语气。根据but后面的过去式,可知是与过去事实相反的虚拟语气。排除AB。D项不能表示虚拟语气。故C正确。句意:我们本应该昨天就受到贺卡的,但是贺卡还没有到。
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