She on her homework in her study now . A. must work B. can work C. must have worked D. mu

发布时间：2020-08-17 13:42:55

She      on her homework in her study now .
A. must work
B. can work
C. must have worked
D. must be working

网友回答

A. must work
B. can work
C. must have worked
(答案→)D. must be working
解析：对正在发生的事进行推测。
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