The old man was seen in the park at 7:00 a.m. yesterday.A. exerciseB. exercisedC. to exer

发布时间：2020-08-21 06:44:05

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：在主动语态中，see sb doing/see sb do ，本题是被动语态，表示在昨天的7点，正在进行的动作，故选D
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