题目内容

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：这个相片中的女士肯定不超过50岁，她看起来那么年轻。must,can(could),may(maight) 可以表示猜测，must 表示肯定猜测，用于肯定句，肯定……，一定……；can’t,表示否定猜测，肯定不……，另外can(could),may(maight)，表示可能性猜测，可能……。根据句意，可知是否定猜测，故选B。
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