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The lady in this photo __  be over fifty! She looks so young!
A.mustn'tB.can'tC.mustD.can
B

试题分析:句意:照片中的这位女士不可能50多岁了,她看起来这么年轻。mustn’t 禁止,不要;can’t 不可能;must 必须;一定;can可能。根据句意可知,这里应该表达否定的意思,因为后面说她看起来很年轻。在否定句中表示推测时,应该用can’t,must表示推测时,不能用在否定句中。故选B。
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