Traffic conditions in Beijing ________ for decades. At first people only complained about jams during rush hours，but today every hour is rush hour.
| A．is worsening | B．have worsened |
| C．have been worsening | D．worsened |
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Traffic conditions in Beijing ________ for decades. At first people only complained about jams during rush hours，but today every hour is rush hour.
| A．is worsening | B．have worsened |
| C．have been worsening | D．worsened |
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