18.In Disneyland,every year,.如下说明

问题描述:

18.In Disneyland,every year,.如下说明
18.In Disneyland,every year,some 800,000 plants are replaced because Disney refused to ________ signs asking his “guests” not to step on them.
A.put off B.put down C.put out D.put up
选择哪个

put up竖立.