The students________(chat)until the teacher came in.

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Thestudents________(chat)untiltheteachercamein.Thestudents________(chat)untiltheteachercamein.Thestu

The students________(chat)until the teacher came in.
The students________(chat)until the teacher came in.

The students________(chat)until the teacher came in.
不可以

The students_chatted until the teacher came in.