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207. (30188-!-item-!-188;#058&005337) (T-4-Q30) Unlikethe short flights of the shuttle and earlier spacecraft, which carriedsufficient power in fuel cells and batteries, a permanently orbiting spacestation will have to generate its own electricity. A.the short flights of the shuttle and earlier spacecraft, which carriedsufficient power in fuel cells and batteries, B. the shuttle andearlier spacecraft, with sufficient enough power in fuel cells and batteriesfor their short flights, C.the short flights of the shuttle and earlier spacecraft, which enabledthem tocarry 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 fortheir short flights, E.the flights of the shuttle and earlier spacecraft, whose shortness allowed themto carry sufficient power in fuel cells and batteries,
为什么在A C D中which指代没有不清楚的问题，但是C中prep就说them指代不清，E中whose指代不清呢？这又是什么原则呀？谢谢！ | 
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发表于 2013-4-16 15:24:55
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