—Where is Jack?I can’t find him anywhere.—He his homework upstairs.A. might have doneB.

发布时间：2020-08-17 13:45:33

—Where is Jack?I can’t find him anywhere.
—He     his homework upstairs.
A. might have done
B. must have done
C. must be doing
D. must do

网友回答

A. might have done
B. must have done
(答案→)C. must be doing
D. must do
解析：must be doing是对目前正在发生的事进行推测。
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