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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 几十年来,南昌的交通状况一直在恶化.起初人们仅仅抱怨交通高峰期的堵塞,但是今天随时都是交通高峰.

解答 答案是C.本题考查现在完成进行时.题干中"for decades"是与现在相联系的段时间,是现在完成时的标志,故排除A、B和D;现在完成进行时表示表示从过去某时开始到现在这一段时间里一直延续着的动作还在继续进行;根据语境中today every hour is rush hour判断,交通状况的恶化还在进行中,故选C.

点评 完成进行时的解题首先要理解其时态的基本用法--表示从过去某时开始到现在这一段时间里一直延续着的动作,特别关注其"在进行中"的特征;然后在语境中寻找动作的时间依据进行判断.

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