问题描述：
一道英语练习题
---Do you often see David_______on the playground?
---No,but he is often seen______ Chinese Kungfu in the park.
A.run,play B.run,to play C.runninf,play D.running,to play
---Do you often see David_______on the playground?
---No,but he is often seen______ Chinese Kungfu in the park.
A.run,play B.run,to play C.runninf,play D.running,to play
问题解答：
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