TrafficconditionsinBeijing

问题详情：

 Traffic conditions in Beijing ______ for decades. At first people only complained about jams during rush hours, but today every hour is rush hour.

A. are worsening                                     B. have worsened      

C. have been worsening                                D. have been worsened

【回答】

C

知识点：动词时态与语态

题型：选择题