before用作连词句型归纳:
(1)before sb.can/could...某人还没来得及……
①Before I could get in a word,he had measured me.
我还没来得及插话,他就给我量好了尺寸。
(2)It will be+时间+before...还有多长时间……才……
②It will be 4 years before he graduates.
他还有四年时间才能毕业。
(3)had done some time before ……才……
③We had sailed four days and four nights before we saw land.我们航行了四天四夜才见到陆地。
(4)had not done...before...不到……就……
④We hadn’t run a mile before he felt tired.
我们还没走到一英里路他就觉得累了。
(5)It was not+一段时间+before不多久就……
⑤It wasn’t two years before he left the country.
还没到两年他们就离开了那个国家。
【即境活用】
10.Someone called me up in the middle of the night,but they hung up ________ I could answer the phone.
A.as
B.since
C.until
D.before
解析:选D。句意为:半夜有人给我打电话,但是在我应答之前对方就挂断了。before表示在……之前,符合题意。
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