－Look, your sister is playing the piano over there.－She ______ be my sister. She has gone to America

题目简介

－Look, your sister is playing the piano over there.
－She ______ be my sister. She has gone to America.

A．mustn’t

B．can’t

C．shouldn’t

D．may not

题型：单选题难度：中档来源：不详

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。