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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
考查情态动词用法。第一空是强调句型的变化形式。第二空是表示有把握的否定的推测。Can’t不可能。句意:——昨天谁可能没有上交?——不可能是Bob,他昨天交了。
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