Because of the popularity of television,children seem to be reading _（ ）A.not as much as beforeB.less than they do beforeC.only a little rather than what they didD.less than they usually did 请讲解为什么要选d而不是b?
问题描述：
Because of the popularity of television,children seem to be reading _（ ）
A.not as much as before
B.less than they do before
C.only a little rather than what they did
D.less than they usually did
请讲解为什么要选d而不是b?
答
此处阐述的是一个过去的事实(过去读书),应该用过去式.
b如果将do变为did亦正确,意思是因为电视的流行,现在的孩子读得比以前少.
d的意思是因为电视的流行,现在的孩子读得比通常的都少了.