The students are ( ) ( ) a dialogue

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Thestudentsare()()adialogueThestudentsare()()adialogueThestudentsare()()adialogueThestudentsare(busy

The students are ( ) ( ) a dialogue
The students are ( ) ( ) a dialogue

The students are ( ) ( ) a dialogue
The students are ( busy ) ( making) a dialogue.意思是：学生们正忙着在编对话.

carrying on 他们正在对话。