问题
选择题
The old man was seen _______ in the park at 7:00 a.m. yesterday.
A．exercise
B．exercised
C．to exercise
D．exercising
答案
答案：D
see sb doing sth表示看到某人正在做某事。
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The old man was seen _______ in the park at 7:00 a.m. yesterday.
A．exercise
B．exercised
C．to exercise
D．exercising
答案：D
see sb doing sth表示看到某人正在做某事。