问题
选择题
— Listen! Helen is singing in the hall.
— It _____ be Helen. She has gone to Beijing. [ ]
A. can't
B. may
C. mustn't
D. should
答案
答案：A
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— Listen! Helen is singing in the hall.
— It _____ be Helen. She has gone to Beijing. [ ]
A. can't
B. may
C. mustn't
D. should
答案：A