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Since then the number of people taking d...

Since then the number of people taking driving lessons _______ 20%.

A. has reduced to     B. has reduced by

C. reduced by         D. reduced to

 

B 【解析】 试题分析:考查动词的时态和语态。句意:自那时以来考驾驶课程人的数目已经以20%的速度减少。since then自从那时起,用于现在完成时;by表示比率作“以…为单位”解时,常与表示单位的名词或数词连用,表示增加或减少了,to增加到;the number of做主语,谓语用单数形式。故选B。 考点: 考查动词的时态和语态  
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