20.In the past two years,the number of campus bookstores offering rentals _____ from a few dozen to 1,500.( 。
A.jumpedB.had jumpedC.is jumpingD.has jumped

分析 在過(guò)去的兩年里,提供租書(shū)的校園書(shū)店的數(shù)量已經(jīng)從幾十家一下增加到一千五百家.

解答 答案:D
題干中In the past two years在過(guò)去的兩年里,表示從過(guò)去到現(xiàn)在的時(shí)間;句意表達(dá)的是現(xiàn)在的結(jié)果,是現(xiàn)在完成時(shí)態(tài)的用法.故選D.

點(diǎn)評(píng) 現(xiàn)在完成時(shí)表示過(guò)去發(fā)生的動(dòng)作對(duì)現(xiàn)在造成的影響或結(jié)果或表示過(guò)去的動(dòng)作或狀態(tài)持續(xù)到現(xiàn)在.用法有:過(guò)去發(fā)生的某一動(dòng)作對(duì)現(xiàn)在造成的影響或結(jié)果或到現(xiàn)在為止已經(jīng)發(fā)生或完成的動(dòng)作;表示過(guò)去發(fā)生的并且持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài).

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