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求解几道英语状语从句的问题(要讲解)

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求解几道英语状语从句的问题(要讲解)
10、 __________I saw the computer,I showed great interest in it.
A.At first B.For the first time C.Until D.The first
11、I knew Mr.Green _____________I knew Mrs.Green.
A.long before B.before long C.long ago D.after long
12、They waited __________it was dark before leaving,_________they didn’t want anyone to see
them leave.
A.since; because B.until; as C.unless; for D.so; because
13、We made a decision __________there would be rain,we should stay at home.
A.that B.if C.that if D.whether
14、I had lived there for over thirty years ___________I wanted to return to my motherland again.
A.until B.after C.while D.when
15、________he woke _________slept,this subject is always in his mind.
A.If; and B.Both; and C.Either; or D.Whether; or
16、We had hardly got to the station __________it began no rain.
A.until B.since C.while D.when
17.They were surprised that a child should work out the problem __________they themselves couldn’t.
A.once B.then C.while D.if
还有这里
D,the first引导时间状语从句,for the first time只能做状语,不能引导从句,at first独立用,不能与句子直接相连,until由句意排除A,before long 的意思是“不久,很快”
. long before有两个用法:
(1) 老早,早就(单独使用,表示比过去某时早得多的时间)(2) 在……的很久以前,在还没有……的很久以前       long ago很久以前,从前;悠远;早;早已      after long 无固定用法