题目信息
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
参考答案及共享解析
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已选答案：
正确答案：
C:how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload
A. that meets demand错误修饰source；
B. which错误修饰source;but前后不平行
C. 正确
D. but转折，改变句子逻辑语义
E. 被动语态不优选；which修饰歧义
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