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标题: 补充250-96 [打印本页]

作者: greenbow43 时间: 2006-4-26 06:01
标题: 补充250-96

There is substantial evidence that certain forms of solar energy either now or within a few years will be economically competitive with conventional sources of heat and power.

(A) either now or within a few years will be economically competitive with conventional sources of heat and power

(B) will either be economically competitive with conventional sources of heat and power within a few years or are so now

(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years

(E) are either now or will be within a few years economically competitive with conventional sources of heat and power

答案为D，我怎么觉得C读的更顺口阿

还有，大全的详细解释在哪儿可以下载阿

作者: yaoyao99 时间: 2006-4-26 08:24
Will be commpetitive now is not grammatically correct.

作者: greenbow43 时间: 2006-4-26 09:02

got it~~~

thank you

作者: rosmarine 时间: 2006-4-26 21:27
now需要的是现在时态，within a few years需要的是将来时态，两个不同时态不能乱揉在一起，只有D是正确清晰的表达，虽然读起来觉得一板一眼的不那么灵巧。

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