－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
考查情態(tài)動(dòng)詞表推測(cè)。mustn’t“禁止”，不表推測(cè)； can’t“不可能”；shouldn’t“不應(yīng)該” ；may not“可能不”。句意“看！你妹妹正在那里彈鋼琴�！薄八豢赡苁俏颐妹�，她去美國(guó)了。”根據(jù)句意，故選B。
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