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（they指代不清，排除）
B. chores; by 1997 that figure had grown to nearly
six hours a week（过去完成时？？）
C. chores, whereas nearly six hours a week were
spent in 1997（逻辑不对，一周6小时，这是一个频率，不能were spent，排除）
D. chores, compared with a figure of nearly six hours
a week in 1997（主语是children，不能与a figure比较？？）
E. chores, that figure growing to nearly six hours a week in 1997（growing不对，排除）
偶能确定排除的是ACE，但是B和D好像都有问题，应该如果选择？答案是B，谢谢指教！
对啊，by 1997要用完成时没有错，但是明明在1981年用的是过去时，那现在好像1997反倒是发生在1981之前似的，所以才觉得特别怪。。。
再顶，希望多些讨论，谢谢
还是觉得怪。。。不过现在再看还是觉得B比较好一些吧...
偶不较劲了。。。-_-
关于小孩不能与数字比较的说法，下面一题怎么解释？
108. (30099-!-item-!-188;#058&004651)
In the United States, while the number of foreign-born residents and their children is higher than ever, the percentage of the population they represent is not; in 1910 this group made up 35 percent of the population when compared to 20 percent in 2000.
(A) population when compared to 20 percent in 2000
(B) population as compared to 2000, when it was 20 percent
(C) population, comparing it with 20 percent in 2000
(D) population, unlike 2000, with 20 percent
(E) population, compared with 20 percent in 2000
我的理解
D的compared是修饰chores，而且spent an average
of slightly less than two and a half hours a week 与figure无可比性，故排除D。
B确实有些怪，但有by，提示应用完成时，如果认为这段话是1997年后讲的，应该可以理解。
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