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_did u leave your classroom?_I saw my daughter sit down and

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_did u leave your classroom?_I saw my daughter sit down and read her book.
Awhen;until Bwhen ;after 为什么选B 我觉得应该选a
until 不和not 连用时,前面常是延续性动词,leave是瞬间性动词,所以这样选.如:I waited him until ten o'clock .
希望可以帮到你!
再问: wait 不是瞬间动词吗????
再答: wait 是延续性动词,能够延续一段时间。