标题: GWD26-Q20求解！！拜谢～～ [打印本页] 作者: 酸菜鱼315 时间: 2011-10-26 17:34 标题: GWD26-Q20求解！！拜谢～～ 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？？？？作者: sss555222111 时间: 2011-10-26 20:10
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，