prep07中的SC

witness236

17. (25335-!-item-!-188;#058&002335)
The success of the program to eradicate smallpox has stimulated experts to pursue what they had not previously considered possible--better control, if not eradication, of the other infections such as measles and yaws.
(A) what they had not previously considered possible--better control, if not eradication, of the other infections such as
(B) what they had not previously considered a possibility--better control, if not eradication, of such infections like
(C) something they had not previously considered possible-better control, if not eradication, of such infections as
(D) something not considered a previous possibility--better control and perhaps eradication, of other infections such as
(E) the possibility of what they had not previously considered--better control and possibly eradication of infections like

这个题给出的答案是C, 请教高人为什么这个答案比A选项好.还有是不是something加定语从句的同位语要优于what的同位语啊

单调唱

楼上解释的很好啊