问题
选择题
—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
答案
答案：A
根据后文的答语She is in Tianjin now，可作出推测，不可能是Helen，故选A
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