Traffic conditions in Beijing for decades. At first people only plained about jams during rush hours，but today every hour is rush hour.
A. is worsening
B. have worsened
C. have been worsening
D. worsened
网友回答
A. is worsening
B. have worsened
(答案→)C. have been worsening
D. worsened
解析：考查现在完成进行时。本题的关键词是for decades多年以来，该时间状语常常与现在完成时连用。而根据句意指多年以来一直都在变得更糟糕，故使用现在完成进行时。句意：北京的交通情况多年以来一直都在变糟糕。起初的时候，人们只是抱怨交通堵塞高峰期。但是现在每个时候都是高峰期。故C正确。