请教while的用法

钱文静

我想请教一下1,while是不是表转折和表同时发生在主语相同情况下都可以用while+doing，区别在于标点，表转折是要用comma

2以下有几道题：

12.   (25105-!-item-!-188;#058&002139)

 

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

答案E

 

45.   (26816-!-item-!-188;#058&003335)

 

A recent poll indicates that many people in the United States hold a combination of conservative and liberal political views; i.e., they denounce big government, saying government is doing too much and has become too powerful, while at the same time supporting many specific government programs for health care, education, and the environment.

 

(A) they denounce big government, saying government is doing too much and has become too powerful, while at the same time supporting

(B) they denounce big government--they say that government is doing too much and has become too powerful--but supporting at the same time

(C) they denounce big government, they say that government is doing too much and it has become too powerful, while they support at the same time

(D) while they denounce big government, saying that government is doing too much and has become too powerful, at the same time supporting

(E) while they are denouncing big government--they say that government is doing too much and it has become too powerful-- supporting at the same time

 

答案是A

130.       (31416-!-item-!-188;#058&004490)

 

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, and have

(D) but introducing some 100,000 dangerous chemical pollutants at the same time that have

(E) but at the same time introduce some 100,000 dangerous chemical pollutants, having

 

第一道除了simultaneously位置不好，是不是还有while是表同时发生和simultaneously重复，问候两道题表转折所以at the same time不重复，还有就是最好while前面不用comma

谢谢！

hifi200111

这个疑问我也有过，觉得12的解释有些牵强。

感觉应该问题出在avoid上！ 查阅了很多资料，while表达对比意思时，没有使用否定句的！

自己琢磨后，觉得这应该是个逻辑正确表达的需要：
A do1 sth1, while doing sth2
如果在while后面使用了否定句（avoid, not,no),逻辑上从句就应该是和主句表达一致性了，所以使用and等连词更合适

希望有人可以谈谈这个问题

钱文静

12题的D没有用否定呀