补充题96. (420) 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
(C) will be economically competitive with conventional sources of heat and power either now or within a few years
(D) either are now economically competitive with conventional sources of heat and power or will be so within a few years(D)
(E) are either now or will be within a few years economically competitive with conventional sources of heat and power
D和E有什么区别?
同问!我选C
E的结构是are A or B, 即 are either now, or are will be,是个错误结构
D没有这个问题
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