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(1).Leave your key with a neighbour__you lock yourself out o

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(1).Leave your key with a neighbour__you lock yourself out one day.
A.ever since B>even if C.soon after D.in case
(2).When did he leave classroom?
Heleft___you turned back to write on blackboard.
A.the time B.until C.the minute D.before
(3).___we know,there are107 elements found in nature.
A.As long as B.just as C.So far as D.For all
1)D 条件状语从句 意思是:放把钥匙给你邻居,以防你哪天不小心把自己锁了.
2)C 他什么时候离开教室的? 你一回头在黑板上写字的时候他就马上走了.
3)C As/So far as we know, 据我们所知