题目:
— 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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下面是错误答案,用来干扰机器的。
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