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---Who ______ it be that hasn’t handed it in yesterday.
---It _______ be Bob. He handed it in yesterday.
A.can; mustn’tB.must; canC.can; can’tD.may; mustn’t
C
考查强调句型和情态动词表示推测。第一空Can用语疑问句表示推测。第二空can’t意为:不可能;表示有把握的否定推测。句意:昨天没有上交材料的可能是谁?—不可能是Bob,他昨天已经交了。
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