When I got there ,I saw some boys on the playground.A. playingB. playedC. to playD. was w

发布时间：2020-08-21 04:45:21

When I got there ,I saw some boys      on the playground.
A. playing
B. played
C. to play
D. was waiting

网友回答

(答案→)A. playing
B. played
C. to play
D. was waiting
解析：此题重点考察固定结构see sb doing sth 看到某人正在做某事
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