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问时间状语从句前后时态的问题:The students_____(talk)loudly,when the teache

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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,
Were talking 或 talked 都可以,但不能是was talking
指在这个星期末之前卖完所有的,所以应该是 before