题目内容
The volunteers __________ many signs to remind people to protect the environment.
A. put through B. put up C. put in D. put out
B 【解析】句意:志愿者们张贴了许多标语来提醒人们保护环境。A. put through完成、使经历、接通; B. put up张贴、挂起;C. put in放进去;D. put out扑灭。“张贴”标语,符合语境。故选:B。
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