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标题: 大全576 [打印本页]

作者: 马尔代夫 时间: 2006-5-3 02:39
标题: 大全576

576. People have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget them every time a new source of cheap energy is developed.
(A) have discovered the principles of solar energy whenever fuel becomes scarce and expensive but will forget
(B) have discovered the principles of solar energy whenever fuel has become scarce and expensive but they forget
(C) discovered the principles of solar energy every time fuel becomes scarce and expensive, forgetting
(D) discover the principles of solar energy every time fuel became scarce and expensive, but they forget
(E) discover the principles of solar energy whenever fuel becomes scarce and expensive but forget

答案是E. 请问整个是什么意思啊?

作者: yaoyao99 时间: 2006-5-3 03:52
Whenever fuel becomes scarce and expensive => people discover the principles of solar energy
BUT
every time a new source of cheap energy is developed => (people) forget them (the principles of solar energy)

作者: 马尔代夫 时间: 2006-5-3 21:05

多谢MM

作者: yaoyao99 时间: 2006-5-3 23:33
Glad to be of help!

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