17．Traffic conditions in Nanchang ____________ for decades．At first people only complained about jams during rush hours，but today every hour is rush hour．（　�。�
A．are worseningB．had worsened
C．have been worseningD．worsened

分析 幾十年來，南昌的交通狀況一直在惡化．起初人們僅僅抱怨交通高峰期的堵塞，但是今天隨時(shí)都是交通高峰．

解答 答案是C．本題考查現(xiàn)在完成進(jìn)行時(shí)．題干中"for decades"是與現(xiàn)在相聯(lián)系的段時(shí)間，是現(xiàn)在完成時(shí)的標(biāo)志，故排除A、B和D；現(xiàn)在完成進(jìn)行時(shí)表示表示從過去某時(shí)開始到現(xiàn)在這一段時(shí)間里一直延續(xù)著的動(dòng)作還在繼續(xù)進(jìn)行；根據(jù)語境中today every hour is rush hour判斷，交通狀況的惡化還在進(jìn)行中，故選C．

點(diǎn)評(píng) 完成進(jìn)行時(shí)的解題首先要理解其時(shí)態(tài)的基本用法--表示從過去某時(shí)開始到現(xiàn)在這一段時(shí)間里一直延續(xù)著的動(dòng)作，特別關(guān)注其"在進(jìn)行中"的特征；然后在語境中尋找動(dòng)作的時(shí)間依據(jù)進(jìn)行判斷．

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