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

A. has reduced to B. has reduced by

C. reduced by D. reduced to

【答案】B

【解析】

試題分析：考查動詞的時態(tài)和語態(tài)。句意：自那時以來考駕駛課程人的數(shù)目已經(jīng)以20%的速度減少。since then自從那時起，用于現(xiàn)在完成時；by表示比率作“以…為單位”解時,常與表示單位的名詞或數(shù)詞連用，表示增加或減少了，to增加到；the number of做主語，謂語用單數(shù)形式。故選B。

考點: 考查動詞的時態(tài)和語態(tài)

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