[求助]GWDTN17-20 (GWD26-Q20)

GWDTN17-20. GWD26-Q20

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

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答案B。  这时态……行吗？
        我选的D

还是有点小纠结……总感觉过去时好一点

D项是错在figure不能和spent ... time相对吗？

同问

不知道D错在哪里

D 项是不是错在 in 1997上啊，原句的意思应该是直到1997年为止。。。不知道是不是这样，我开始就选的D

D有什么错误啊？

修饰没有错误，比较对象因为出现了a figure，明确是与前面的数字作比较。

如果是说in 1997有问题，那么表示“在某一时间的数字”用什么样的介词呢？

而且GMAT很喜欢这个结构啊~~~~~