-----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
考查情態(tài)動詞用法。第一空是強調(diào)句型的變化形式。第二空是表示有把握的否定的推測。Can’t不可能。句意：——昨天誰可能沒有上交？——不可能是Bob，他昨天交了。
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