_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

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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
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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
_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

_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!

B after一般用在过去式 until一般与not连用

until用于否定句

when,until -你什么时候离开教室的? -直到看见女儿坐下来读书。
when,after -你什么时候离开教室的? -看到女儿坐下来看书之后。

你什么时候离开的教室?
在看到我女儿在坐着看书后离开的。可能那个人在监督他女儿看书,在确定他女儿在看书后,就离开了,而不是直到看到我女儿在坐着看书就离开了。