The children were playing chess just now.对 were playing chess 部分提问()()the children ()just now.

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Thechildrenwereplayingchessjustnow.对wereplayingchess部分提问()()thechildren()justnow.Thechildrenwereplay

The children were playing chess just now.对 were playing chess 部分提问()()the children ()just now.
The children were playing chess just now.对 were playing chess 部分提问
()()the children ()just now.

The children were playing chess just now.对 were playing chess 部分提问()()the children ()just now.
What were...doing

What were the children doing just now?