问题补充:
You have worked for a long time. You be very tired.
A. must
B. can’t
C. could
D. mustn’t
答案:
(答案→)A. must
B. can’t
C. could
D. mustn’t
解析:句意:你已经工作很久了。你一定很累。Must必须;can’t不能,不会,不可能;could能。会;mustn’t禁止,不允许。表示肯定的推测常用must be,所以选A。
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