Q20

In 1981 children in the LACE w:st="on">United StatesLACE> spent an average

of slightly less than two and a half hours a week doing

household chores; by 1997 they had spent nearly six

hours a week.

A. chores; by 1997 they had spent nearly six hours

a week

B. chores; by 1997 that figure had grown to nearly

six hours a week

C. chores, whereas nearly six hours a week were

spent in 1997

D. chores, compared with a figure of nearly six hours

a week in 1997

E. chores, that figure growing to nearly six hours a

week in 1997

答案B，可为什么要用过去完成时啊。我选E。

E已经改变了原文的逻辑意思了。

我记得初中的时候英语老师这样说，by+一个时间作为时间状语，就是过去完成时的标志了。不知道现在是不是也能这样讲。

如果可以用过去完成时，A为什么不行呢？

E 怎么改变逻辑了呢？

D 的错误是不是分词有修饰前面名词chores的歧异。

C 我觉得不好，具体有什么语法错误呢？

谢谢