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