Since then the number of people taking driving lessons______20%.
A.has increased toB.increases by
C.has increased byD.have increased
C

試題分析:考察時(shí)態(tài)。本題的關(guān)鍵是時(shí)間狀語(yǔ)since then,該時(shí)間狀語(yǔ)和現(xiàn)在完成時(shí)連用。句意:從那時(shí)起,參加駕駛考試的人的數(shù)量已經(jīng)上升了百分之20.句中的介詞by表示程度;to表示結(jié)果。故C正確。
點(diǎn)評(píng):時(shí)態(tài)題的考查關(guān)鍵是抓住句子的上下文含義和句中的時(shí)間狀語(yǔ)。要根據(jù)時(shí)間狀語(yǔ)來(lái)選擇合適的時(shí)態(tài),在平時(shí)的學(xué)習(xí)中要注意積累有關(guān)時(shí)態(tài)的用法和各種時(shí)態(tài)的特殊之處。如since, so far等經(jīng)常與現(xiàn)在完成時(shí)連用。在條件狀語(yǔ)從句中用一般現(xiàn)在時(shí)代替將來(lái)時(shí)等等。
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