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标题: GWD26-Q20 [打印本页]

作者: coffeeqoo    时间: 2012-4-8 17:15
标题: GWD26-Q20
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.    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

求问正确答案B中时态如何理解?
作者: coffeeqoo    时间: 2012-4-10 08:17
求指点!




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