问题
选择题
—Listen! Is that Kate singing in the room?
—No. It _____ be Kate. She hasn't been back from Beijing yet. [ ]
A. must
B. can't
C. mustn't
答案
答案：B
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—Listen! Is that Kate singing in the room?
—No. It _____ be Kate. She hasn't been back from Beijing yet. [ ]
A. must
B. can't
C. mustn't
答案：B