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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：
老师好，这道题A我算下来有多个解，可以是1，也可以是任何数，为什么要选A？谢谢
解答：
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