问时间状语从句前后时态的问题：The students_____(talk)loudly,when the teacher came in.
我觉得这里应该填was talking啊,为什么答案是talked?
"
If you can sell them all______the end of this week,you can have the job."
A.after B.until C.before D.till
我纠结untill还是before，