It wasn’t until that to prepare their lessons. A. did the teacher come in; students began B. the teacher came in; the students began C. did the teacher come in; did the students begin D. The teacher came in; did the students begin 查看更多

 

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 It wasn’t until_______that_______to prepare their lessons.

A. did the teacher come in; the students began

B. the teacher came in; the students began

C. did the teacher come in; did the students begin

D. the teacher came in; did the students begin

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