You have worked for a long time. You ____________ be very tired.       
A．mustB．can’tC．couldD．mustn’t
A

試題分析：句意：你已經(jīng)工作很久了。你一定很累。Must必須；can’t不能，不會(huì)，不可能；could能。會(huì)；mustn’t禁止，不允許。表示肯定的推測(cè)常用must be，所以選A。
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