问题
选择题
-Listen! Helen is singing in the next room.
-It __________ be Helen. She has gone to Beijing.[ ]
A. can't
B. mustn't
C. may
D. should
答案
A
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-Listen! Helen is singing in the next room.
-It __________ be Helen. She has gone to Beijing.[ ]
A. can't
B. mustn't
C. may
D. should
A