One automobile manufacturer has announced plans to increase the average fuel efficiency of its sport utility vehicles by 25 percent over the next five years, amounting to roughly five miles per gallon, and representing the first significant change in the fuel efficiency of any class of passenger vehicle in almost two decades.
(A) amounting to roughly five miles per gallon, and representing
(B) amounting to roughly five miles per gallon, and it would represent
(C) an increase that would amount to roughly five miles per gallon and it would represent
(D) an increase that would amount to roughly five miles per gallon and would represent
(E) which is an increase amounting to roughly five miles per gallon, representing
疑问有2个：
1. and前面有没有逗号，这么重要吗？
2. 有些题目讲解错的选项时，说would表示过去将来时，那么这个地方为何可以用would呢？
-- by 会员 xuyuanwai (2012/10/28 16:03:35)