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

試題分析：句意：這個相片中的女士肯定不超過50歲，她看起來那么年輕。must,can(could),may(maight) 可以表示猜測，must 表示肯定猜測，用于肯定句，肯定……，一定……；can’t,表示否定猜測，肯定不……，另外can(could),may(maight)，表示可能性猜測，可能……。根據(jù)句意，可知是否定猜測，故選B。
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