GMAT语法一道.In 1981 children in the United States spent an aver

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GMAT语法一道.
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.\x05chores; by 1997 they had spent nearly six hours a week
B.\x05chores; by 1997 that figure had grown to nearly six hours a week
C.\x05chores,whereas nearly six hours a week were spent in 1997
D.\x05chores,compared with a figure of nearly six hours a week in 1997
E.\x05chores,that figure growing to nearly six hours a week in 1997
D怎么错了,尤其是C.

是语法指代的问题.不能出现歧义.分号前后都是一个独立的句子.当然句子之间也是有一定的联系的
B.\x09前面有且仅有一个figure,且明确定义了,所以用"that figure"意思就是如前所述定义的figure.
A,by 1997 they had spent nearly six hours a week （on what?究竟做什么了?没人知道）
C nearly six hours a week were spent in 1997 谁在花费时间做做什么?没人知道的啦.也是不清楚
D compared with a figure of （what figure?a是泛指,世界上任何一个figure的可以吗?）nearly six hours a week in 1997
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