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
答案是D，我选的B。
抛开B的sufficient enough 语义重复， D 中的which也不能指代2个名词啊（the shuttle and earlier spacecraft）
NN们看能不能讲解一下。 | 
