问题

The air pollution of the city ____ by 20 percent thanks to the strict measures taken by the government.
A:has been fallen down
B:has been increased
C:has been reduced
D:has been risen
B:has been increased
C:has been reduced
D:has been risen
正确答案是:
同类题型
The sooner we students________to the new school, the better it will be________our studies. [ ]
We have a lot of work______today.
Susan, I have a sore throat.—You talked ______ just now. Please drink more water.
The victims of the earthquake are in need of help. We should do something for them immediately.