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题库 / GmatLaCourse-SC-28
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.
the short flights of the shuttle and earlier spacecraft, which carried sufficient power in fuel cells and batteries,
the shuttle and earlier spacecraft, which were capable of carrying sufficient power in fuel cells and batteries for their short flights,
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略
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题目分析：
本题的比较对象应该是“shuttle和earlier spacecraft”和“a permanently orbiting space station”，而不能是一种flight和space station比较，答案为(B)。