问题描述：
GMAT语法一道.
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 six hours a week.
A.\x05chores; by 1997 they had spent nearly six hours a week
B.\x05chores; by 1997 that figure had grown to nearly six hours a week
C.\x05chores,whereas nearly six hours a week were spent in 1997
D.\x05chores,compared with a figure of nearly six hours a week in 1997
E.\x05chores,that figure growing to nearly six hours a week in 1997
D怎么错了,尤其是C.
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 six hours a week.
A.\x05chores; by 1997 they had spent nearly six hours a week
B.\x05chores; by 1997 that figure had grown to nearly six hours a week
C.\x05chores,whereas nearly six hours a week were spent in 1997
D.\x05chores,compared with a figure of nearly six hours a week in 1997
E.\x05chores,that figure growing to nearly six hours a week in 1997
D怎么错了,尤其是C.
问题解答：
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