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:照片中的這位女士不可能50多歲了，她看起來(lái)這么年輕。mustn’t 禁止，不要；can’t 不可能；must 必須；一定；can可能。根據(jù)句意可知，這里應(yīng)該表達(dá)否定的意思，因?yàn)楹竺嬲f(shuō)她看起來(lái)很年輕。在否定句中表示推測(cè)時(shí)，應(yīng)該用can’t，must表示推測(cè)時(shí)，不能用在否定句中。故選B。
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