题目内容
?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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题目内容
?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