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?

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Becauseofthepopularityoftelevision,childrenseemtobereading_()A.notasmuchasbeforeB.lessthantheydobefo

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?
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?

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?
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.