Luckily,all the students got out of the teaching building___

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Luckily,all the students got out of the teaching building___it fell down.
A.until B.before C.since D.while
请问选哪一个,为什么?

选B before 在……之前幸运的是,在教学楼倒塌之前,所有的学生都已出去了.
A until 直到……才……
C 自从；因为
D 当……的时候；然而

Luckily,all the students got out of the teaching building___ This is a r_____style of teaching.All the students like it.要 The r____ of the students’math test is good.we all got "A".按 of all the students he When the soldier got out of the river , he was wet all o___. all the students 和 all of the students 分别? all the students 还是all of the students all the things out of The building___(destory) by fire 英语翻译Luckily the bus ahead of us turned out of the road at an all of the students为什么要有the All of the students have___winning the game.