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[Sentence Correction]
试题详情
题目：
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.
选项:
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
提问：
用in 1997排除了ab，然后又排除了c.因为前面是us 做主语，后面whereas不对称，排除e，同理figue不应该独立做个主语……麻烦帮分析下这题正确的思路谢谢
解答：
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