可以填 ：playing
意思是：昨天一些男孩被看见正在操场上踢足球.
或者 填：to play
意思是：昨天一些男孩被看见在操场上踢足球（指被看见踢足球的全过程）.
Some boys were seen ————(play)football on the playground yesterday
Some boys were seen ————(play)football on the playground yesterday
英语人气：548 ℃时间：2019-08-19 15:05:54
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