—Did the teacher leave early.—No.____ all the students left.

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—Did the teacher leave early.—No.____ all the students left.A.Until B.After
为什么不能填B,该怎样理解,求指教!

B 指的是“时间”之后,其后加时间,（常用于过去式）,如：
After 3 years,he left for Beijing.
A 可以用于否定,且可以与(瞬间动词如“完成”）动词搭配,如：
I didn't finish my hone work until 10 o'clork.(我没有做完作业直到10点（才做完））.

—Did the teacher leave early.—No.____ all the students left. did you leave the park early yesterday afternoon?no,I__there the teacher （）the students leave for home early because the The students all stood up ____ the teacher came in. All the students talked ____(excited)until the teacher came When did he leave the classroom?— He left ----- you turned b the teacher asked the ___________ students from the left to All the students should ____(listen) to the teacher ______(c the teacher spoke loudly ____ _____ all the students could f what the teacher said ____ (able) all the students to study Did you leave the office early this afternoon Did you catch the first bus this morning?——No,It had left th