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.

1. the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries
2. the shuttle and earlier spacecraft, with sufficient enough power in fuel cells and batteries for their short flights
3. the short flights of the shuttle and earlier spacecraft, which enabled them to carry sufficient enough power in fuel cells and batteries
4. the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights
5. the flights of the shuttle and earlier spacecraft, whose shortness allowed them to carry sufficient power in fuel cells and batteries

The answer is D, I choose B, why?

with引导的部分会出修饰歧义，有可能是最近的名词性结构，即the shuttle and

earlier spacecraft； 但也有可能是句子的主句主语，即space station.

看过一个总结，里面提到不要对with引导的修饰有好感。

 B中sufficient与enough也重复了。修饰成分短语太长了，一般这种情况下能用从句理清

脉络最好。

D的话 提炼一下句子成分： the replacement and improments, the output tripled... 前面的从句完全是个名词性的短语，在句子里是不能构成成分的。

C的with构成独立主格结构，距离这个结构最近的名词结构正好也是主句的主语，所以并不存在修饰歧义。