答案错了？

LeannaChina

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
   
   答案是D 我怎么看 也不能是which were 呀 各位选什么呢 嘿嘿 谢谢啦
   

LeannaChina

那个which were 怎么解释呢 O(∩_∩)O~

梦宝要米国

通过unlike排除1 3 5
2中 sufficient和enough同义重复呀