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Mr. Smith has promised that all of us will pass the exam, so it ____ so difficult as you imagine.
A.can’t have been B.can’t be
C.mustn’t have beenD.mustn’t be
B
考察情态动词用法。AC是对过去情况的说明。D不能表示推测。Can’t be不可能;结合句意可知B正确。句意:史密斯先生答应所有人都能通过考试。所以试卷不可能像你想象的那么难。
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