Question

【题目】When I walked past the park,I saw some old people____Chinese Taiji

A. doB. didC. doingD. are doing

Answer 1

【答案】C

【解析】

句意：当我走过公园的时候，我看见一些老人正在练中国太极。A. do做，原形；B. did做，过去式；C. doing做，现在分词；D. are doing正是，现在分词。短语see sb. doing sth.表示看见某人做某事。根据题意，故选C。