In 1981 children in the United States spent an averageof slightly less than two and a half hours a week doinghousehold chores; by 1997 they had spent nearly six hours a week.
A.chores; by 1997 they had spent nearly six hoursa week
B.chores; by 1997 that figure had grown to nearlysix hours a week
C.chores, whereas nearly six hours a week werespent 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
我选的E。 答案B。可是为什么是过去完成时:had grown.... 请大家来探讨一下应该怎么理解哦
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