In 1981 children in the United States spent an averageof 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
我想知道,C选项为什么会错了呢?whereas怎么用呀,求nn
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