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 answer:b mine:e 1)关于时态:a,b分号前,1981年的事情用一般过去时态,而分号后,1977年的事情用过去完成时态,说明1977年的事情发生在1981年前,逻辑不合理. 2)我选e,that figure growing是独立主格结构时态没有问题. 3)a中they不对,因为1981年的chilldren到1997年已经不是chilldren了不能用they只代只能用those指代同一类人. 4)c被动语态不好 5)copampared就近修饰chores,逻辑不合理
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