GWD26-q20

kingsonosgnik

20. GWD26-Q20
In 1981 children in the United States spent an average of slightly less than two and a half hours a week doing household chores; by 1997 they had spent nearly sixhours 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 weekin 1997
E.     chores, that figure growing to nearly six hours a week in1997


能解释一下a b c 吗？
答案选b

seyouji

A，C结构不完整；de因为换逗号以后，句子成分有点怪。

judydongxueni

这个题目要用过去完成式，cde不对

a的话没有b好