I often see some boys_____(play)on the playground.I can often see them____(do) so.

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I often see some boys_____(play)on the playground.I can often see them____(do) so.
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I often see some boys_____(play)on the playground.I can often see them____(do) so.
I often see some boys_____(play)on the playground.I can often see them____(do) so.

I often see some boys_____(play)on the playground.I can often see them____(do) so.
这个题是常见题.其实就考了一个词,那就是see,首先,你要知道see是一个感官动词,它有它的特定用法.
see +宾语+【动词原形】或者【现在分词】或者【p.p】
【现在分词】 表示 主动和动作正在进行2个意思.
【p.p】 表示 被动和动作完成2个意思
所以,这个题,boy和 play之间的关系为主动.因而,第一空,可以填play也可以填playing 第二空可以填do也可以填doing

playing
doing
see sb doing sth这是一个固定用法