急求机经题,非常急,盼解

GWD-26-Q20

3  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

8月JJ有此题, GWD中答案是B .  可是B不仅时态不对,而且和前句之间也没有连词啊.  而且E没有错啊, 独立主格结构.  盼NN们解答. 多谢! 下周考,急

1st: "by 1997" is different meaning with "in 1997". This will change original meaning of the sentense.

2nd: If you want to use E, it should be like "chores, and that figure growing ..."

Above is my two cents.

祝你成功！