1. 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
问一下，这类语序的问题到底应该怎么判断
如果E 改为 either are now or will be within.......................
可以吗？
(F) are now, or will be within a few years, economically competitive with conventional sources of heat and power
这样应该是可以的。E选项总觉得不妥不敢选。
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