4.Our government has taken some measures to overcome the lack of electricity, but it may take some time _____ we have enough power.
Asince B. after
C. unless
D. before
【答案】D
【解析】考察固定结构。It be 一段时间 before从句:一段时间以后某事才发生;结合句意可知D正确。句意:我们的政府已经采取了一些措施来克服电力紧缺的问题,但是也许要一段时间以后我们才会有足够的电力。
5.All the task ______ ahead of time, they decided to go on holiday for a week.
A. had been finished
B. were finished
C. having been finished
D. been finished
【答案】C
【解析】考察独立主格结构。本题逗号前后两部分之间没有连词,什么逗号前面的不是一个完整的句子,故AB排除。D项的结构不完整。All the task having been finished=After all the task has been finished.
6.The accident that happened at an oilfield____ the southeast coast of the U.S.A has caused great damage to the environment.
A.away B.from
C.beyond
D.off
【解析】考察介词用法。Off与coast连用,表示在海岸线之外。
7.We are at your service. Don’t
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