The plan of cleaning up the city parks has been (put on ,put

The plan of cleaning up the city parks has been (put on ,put A ban on the importation of this kind of milk has been put o the sports meeting has put up because of rain put the burden of on Helping cleaning up the city parks takes me two hours ...为什么 Attention,please.The flight has to be_____.A.put on B.put of police have put up posters around the city with photos of th put up the put up the picture They put up tent by the fire..这里为什么用put up?不能用put out和put on The next morning a notice was put up on the door of the work put on,put off,put up,put