题目内容

When I walked past the park, I saw some old people ________ Chinese Taiji.

A. does B. did C. doing D. are doing

C 【解析】 试题解析:句意:当我经过公园的时候,我看见一些老人在打太极拳。看见某人在做某事用see somebody doing something,所以选C。
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