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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.

正确答案: B

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发表于 2011-10-26 17:34:00 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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
我不懂B为什么用过去完成时????
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沙发
发表于 2011-10-26 20:10:31 | 只看该作者
过去完成时只有在过去时间之前发生才能用,与过去到现在的时间长短无关,
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