－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 |
－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 |
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