117. Performing a risky maneuver that required precision flying, not only did space shuttle astronauts retrieve an orbiting satellite, it was done simultaneously while avoiding being rear-ended by a passing ultraviolet telescope.
A. not only did space shuttle astronauts retrieve an orbiting satellite, it was done simultaneously while avoiding
B. not only was an orbiting satellite retrieved by space shuttle astronauts, but they also simultaneously avoided
C. an orbiting satellite was retrieved by space shuttle astronauts who also avoided simultaneously
D. space shuttle astronauts retrieved an orbiting satellite, simultaneously while avoiding
E. space shuttle astronauts retrieved an orbiting satellite and simultaneously avoided
D项 while ＋ －ing 做伴随状语， 逻辑主语为astronauts，我个人感觉伴随这个状态更好一点，大家的意见呢？
LZ搜下讨论吧！有过的。
讨论链接：http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=238541&page=1
谢谢支持！
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=240314&page=1
还没加入汇总，但这个讨论贴就在该区首页。
这里while引导的是时间状从，所以前面加simultaneously 就重复了，但是当while表转折状从的时候，是可以加表示同时意思的短语或词的修饰，如PREP里有一题：
Industrialization and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced some 100,000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago. A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having B. while at the same time introducing some 100,000 dangerous chemical pollutants that have C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have D. but introducing some 100,000 dangerous chemical pollutants at the same time that have E. but at the same time introducing some 100,000 dangerous chemical pollutants, having 答案选B，这里while是引导转折关系的从句。
A. while at the same time they have introduced some 100,000 dangerous chemical pollutants, having
B. while at the same time introducing some 100,000 dangerous chemical pollutants that have
C. while they have introduced some 100,000 dangerous chemical pollutants at the same time, which have
D. but introducing some 100,000 dangerous chemical pollutants at the same time that have
E. but at the same time introducing some 100,000 dangerous chemical pollutants, having
答案选B，这里while是引导转折关系的从句。
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