【题目】We ________ a sign at the park entrance to tell people to protect the trees and flowers.
A. put down B. put up C. put away D. put off
在线课程【答案】B
【解析】考查动词词组。A. put down放下；B. put up举起，张贴；C. put away把---收起来放好；D. put off推迟，拖延。句意：我们在公园门口贴了一个标志，告诉人们要保护树和花。故选B。