This approach, ______ more expensive than the basic one, provides us with consid
题型：不详难度：来源：
| This approach, ______ more expensive than the basic one, provides us with considerably more usage flexibility. |
答案
| C |
解析
试题分析：考查连词。A.as因为，一边．．．一边，尽管（要用倒装）B. since既然，自从．．．以来C.ｗhile当．．．时候，尽管D.if如果。句意：这种方法，尽管比基本方法更昂贵，但我们提供了更多的使用灵活性。故选Ｃ
点评：不同的连词要放在上下文中进行考查，要注意一词多义，如本题中as ，while均有“尽管”之意，但as要用倒装，while不能用倒装。
即学即练：We need some more facts and figures __________ we take the final decision.
A. since B. before C. after D. until
选B |
举一反三
I think you should complain, _____, of course, you are happy with the way things are.| A．until | B．although | C．when | D．unless |
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| Mary and I have been close friends ______ we met each other 10 years ago. |
They were surprised that a child should work out the problem____ they themselves could not.| A．once | B．unless | C．while | D．if |
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_________ advertisements are of great help, I don’t think we should entirely rely on them.| A．Since | B．While | C．Because | D．As |
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| Try your best to help the people when they are in trouble, _______you will feel pleased and happy. |
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