---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
考查強(qiáng)調(diào)句型和情態(tài)動詞表示推測。第一空Can用語疑問句表示推測。第二空can’t意為：不可能；表示有把握的否定推測。句意：昨天沒有上交材料的可能是誰？—不可能是Bob,他昨天已經(jīng)交了。
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