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        1. 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,不可能;could能。會;mustn’t禁止,不允許。表示肯定的推測常用must be,所以選A。
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