问题
Listen ! Helen is singing in the next room.—It __________ be Helen. She is in Tianjin now.
A:can’t
B:mustn’t
C:may not
D:shouldn’t
B:mustn’t
C:may not
D:shouldn’t
正确答案是：
同类题型
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Excuse me, can I interview Mr. Miller this afternoon?—A moment, please. Let me check ______.[ ]
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