The old man was seen in the park at 7:00 a.m. yesterday.A. exercise B. exercisedC. to exe

发布时间：2020-08-21 06:33:28

The old man was seen      in the park at 7:00 a.m. yesterday.
A. exercise
B. exercised
C. to exercise
D. exercising

网友回答

A. exercise
B. exercised
C. to exercise
(答案→)D. exercising
解析：see sb doing sth表示看到某人正在做某事。
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