Private cars are required to turns off roads one out of five weekdays        the traffic pressure.

A．to reduce        B．reducing           C．reduce          D．reduced

Private cars are required to take turns off roads one out of five weekdays ____the

      traffic pressure.?

      A.to reduce               B.reducing?

      C.reduce                          D.reduced?

Private cars are required to take turns off roads one out of five weekdays ___the traffic pressure.

Private cars are required to take turns off roads one out of five weekdays ___the traffic pressure.

A．relieve           B．relieving          C．torelieve          D．relieve

Private cars are required to take turns off roads one out of five weekdays ____the traffic pressure.

Private cars are required to take turns off roads one out of five weekdays ___the traffic pressure.

1. A.
   relieve
2. B.
   relieving
3. C.
   torelieve
4. D.
   relieve

Private cars are required to take turns off roads one out of five weekdays ____the traffic pressure.

1. A.
   to reduce
2. B.
   reducing
3. C.
   reduce
4. D.
   reduced

Private cars are required to take turns off roads one out of five weekdays______the traffic pressure.

1. A.
   relieve（緩解）
2. B.
   to relieve
3. C.
   relieving
4. D.
   relieved

Private cars are required to take turns off roads one out of five weekdays ____the traffic pressure.

     A. reducing       B. reduce             C. to reduce        D. reduced