The naughty boy was seen ( )chalk in the calssroom.答案是playing with为什么不能填to be playing withto be doing表示什么?

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The naughty boy was seen ( )chalk in the calssroom.答案是playing with为什么不能填to be playing withto be doing表示什么?
The naughty boy was seen ( )chalk in the calssroom.
答案是playing with
为什么不能填to be playing with
to be doing表示什么?

The naughty boy was seen ( )chalk in the calssroom.答案是playing with为什么不能填to be playing withto be doing表示什么?
to be doing表示在将来某时间正在干某事
playing with 表示他正在玩

表示看见他正在