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标题: 请教一下 GWD26-Q12 [打印本页]

作者: stone12321 时间: 2008-10-13 11:14
标题: 请教一下 GWD26-Q12

The most vexing problem faced by researchers exploring wind-powered
        generation of electricity is achieving a constant flow of power
            from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden
        voltage increases

A. achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload

B. achieving a constant flow of power from an
unpredictable natural source, which meets demand but without overloading

C. how to achieve a constant flow of power
from an unpredictable natural source, a flow that meets demand but does not overload

D.      how to achieve a constant flow of power
        from an unpredictable natural source, but
        a flow that meets demand without overloading

E. how a constant flow of power from an unpredictable natural source can be achieved, which
meets demand but does not overload

答案是C

弱弱的问D为啥不对呢？

谢谢

作者: chinesefrank 时间: 2008-10-13 11:46
如果选D，but后要一个句子，而D选项后为一个名词

作者: stone12321 时间: 2008-10-13 12:09

但but不是可以作介词吗？

作者: ycy601 时间: 2008-11-21 08:39

but:

prep.
除...以外
conj.
而是, 但是
adv.
几乎, 仅仅

根据本题句意，bu此处是但是的意思

作者: shapooya 时间: 2012-2-23 04:37
为神马a,b不对呢？不能用achieving吗？

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