The old man was seen _______ in the park at 7:00 a.m. yesterday.
A.
exercise
B.
exercised
C.
to exercise
D.
exercising
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【单选题】Task 22 Falls are the number one cause of death to old people at home. Most old people can live safely at home if they make a few changes. Falls are common as people are getting older. Up to half of h...
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