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 在過去的兩年里，提供租書的校園書店的數(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在過去的兩年里，表示從過去到現(xiàn)在的時間；句意表達的是現(xiàn)在的結果，是現(xiàn)在完成時態(tài)的用法．故選D．

點評 現(xiàn)在完成時表示過去發(fā)生的動作對現(xiàn)在造成的影響或結果或表示過去的動作或狀態(tài)持續(xù)到現(xiàn)在．用法有：過去發(fā)生的某一動作對現(xiàn)在造成的影響或結果或到現(xiàn)在為止已經(jīng)發(fā)生或完成的動作；表示過去發(fā)生的并且持續(xù)到現(xiàn)在的動作或狀態(tài)．

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