Question

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

A. has reduced to B. has reduced by

C. reduced by D. reduced to

Answer 1

【答案】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