Luckily,all the students got out of the teaching building___

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?

毛毛的爱 1年前已收到6个回答举报

wuzhongxu 幼苗

共回答了13个问题采纳率：84.6% 举报

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

1年前

小公主杰西卡幼苗

共回答了310个问题举报

b 教学楼倒塌前所有学生都跑出来了

1年前

小雄007 幼苗

共回答了87个问题举报

before
幸运的是，在教学楼倒塌之前所有的学生都出来了

1年前

seon77 幼苗

共回答了428个问题举报

B 之前，所以幸运呀

1年前

dreamyy423 幼苗

共回答了910个问题举报

B. 幸运的是，在楼塌前所有的学生都撤离了

1年前

吴长青幼苗

共回答了9个问题举报

D 在……期间
我理解成：在学生们离开教学楼期间，楼塌了。。。。。

1年前

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