He did well in the examination. He hard at his lessons..A. must have workedB. can have wo

发布时间：2020-08-16 10:41:54

He did well in the examination. He      hard at his lessons..  
A. must have worked
B. can have worked
C. will have worked
D. has worked

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(答案→)A. must have worked
B. can have worked
C. will have worked
D. has worked
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