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-Look, your sister is playing the piano over there.
-She ______ be my sister. She has gone to America.
A.mustn’tB.can’tC.shouldn’tD.may not
B
考查情态动词表推测。mustn’t“禁止”,不表推测; can’t“不可能”;shouldn’t“不应该” ;may not“可能不”。句意“看!你妹妹正在那里弹钢琴。”“她不可能是我妹妹,她去美国了。”根据句意,故选B。
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