又一题prep

szxissean · 发表于 2013-7-20 06:54:27

Industrializationand modern methods of insect control have improved the standard of livingaround the globe while at the same time they have introduced some 100,000dangerous chemical pollutants, having gone virtually unregulated since theywere developed more than 50 years ago.

(A)while at the same time they have introduced some 100,000 dangerous chemicalpollutants, having

(B)while at the same time introducing some 100,000 dangerous chemical pollutantsthat have

(C)while they have introduced some 100,000 dangerous chemical pollutants at thesame time, which have

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

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

答案是b我选的c,我怎么觉得have introduced应该和have improved对称啊

xiqiong · 发表于 2013-7-20 09:34:20

you don't have to have 100% PERFECT parallelism - i.e., the verbs don't have to be in the same tense (and indeed context may demand that they not be in the same tense) - but, if one part is an actual verb, then parallelism demands that the other part be an actual verb, too.

----- ron
http://www.manhattangmat.com/forums/industrialization-and-modtern-methods-of-insect-control-have-t460.html

abc791201064 · 发表于 2013-7-20 11:15:04

这个题目我也错过主要是that 和which 限定性和非限定性意思有不同的地方

又一题prep

所属分类: 下线版块

正在浏览此版块的会员 ()