◎ 题干
— Listen! Someone is singing in the music room. It ______ be Jim. He practices singing there every day.
— It ______ be him. He has gone to Beijing.
[     ]
A. can; can't
B. must; may not
C. must; can't
D. may; may not
◎ 答案
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◎ 解析
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◎ 知识点
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