Private cars will be required to stay off roads one out of five weekdays ____ the traffic pressure.
#95410
A
to reduce
B
reducing
C
reduced
D
reduce
推荐题目
 _____ what would happen,none of them could find a way out. 
#90766
A
Left wondering
B
Having left wondering
C
Leaving to wonder
D
Having left to wonder
Each button, when ____, provides a piece of beautiful music.
#88692
A
clicked
B
having clicked
C
clicking
D
being clicked