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
因为有分号存在,所以前后句子可以不用考虑时态呼应问题,B 的过去完成时态没错。
我觉得E 语法上没错,可以是独立主格, that figure growing to nearly six hours a week in 1997 和原句相比,独立主格变为从属成分,改变句子重心。
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