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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。