标题: 请教个GWD,对时态的选择是在不理解！！！ [打印本页] 作者: Iljiajia 时间: 2010-4-19 13:05 标题: 请教个GWD,对时态的选择是在不理解！！！ 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