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