问题
选择题
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
答案
答案：A
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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
答案：A