In 1981 children in the United States spent an averageof slightly less than two and a half hours a week doinghousehold chores; by 1997 they had spent nearly six hours a week.
A.chores; by 1997 they had spent nearly six hoursa week
B.chores; by 1997 that figure had grown to nearlysix hours a week
C.chores, whereas nearly six hours a week werespent 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
正确答案是B.我觉得时态有问题,1997在1981之后,为什么1997用过去完成时,而1981用一般过去时啊?想不通,望NN指教
| 
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2011-6-13 13:47:43
收藏
收藏
楼主
