问题
选择题
—Listen! Is Betty singing in the next room?
—No. It ______ be Betty. She has gone to Beijing. [ ]
A. mustn't
B. may
C. can't
D. can
答案
答案：C
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—Listen! Is Betty singing in the next room?
—No. It ______ be Betty. She has gone to Beijing. [ ]
A. mustn't
B. may
C. can't
D. can
答案：C