In 1981 children in the United States
spent an average
of slightly less than two and a half hours a week doinghousehold chores; by 1997 they had spent nearly six hours a week.
A.chores; by 1997 they had spent nearly six hoursa week
B.chores; by 1997 that figure had grown to nearlysix hours a week
C.chores, whereas nearly six hours a week werespent 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
为什么D不对呢?请求大牛指教,谢谢!
-- by 会员 louisehu (2012/7/8 17:45:05)