prep一道。。求解

思路小朋友

207.(30188-!-item-!-188;#058&005337)(T-4-Q30)



Unlike the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries, a permanently orbiting space station will have to generate its own electricity.

A. the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries,

B. the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and batteries for their short flights,

C. the short flights of the shuttle and earlier spacecraft, which enabled them to carry sufficient enough power in fuel cells and batteries,

D. the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights,

E. the flights of the shuttle and earlier spacecraft, whose shortness allowed them to carry sufficient power in fuel cells and batteries,

根据UNLIKE语法的要求，排除ACE，但是剩下的BD中的their指什么啊，因为前面没有复数名词啊。。。所以很迷茫
求高手指导

miller811

主语是compound，所以用their问题不大  其一 BD都有their 其二代词不是绝对错误
B中sufficient和enough重复

kudoucliff

be capable of doing还是be capable to do
每次遇到这种情况我就会毫不犹豫地舍弃不是to do的……