Everyone should keep the environment(cleaning)?为什么不用clean?

来源：学生作业帮助网编辑：作业帮时间：2024/05/09 09:16:31

Everyone should keep the environment(cleaning)?为什么不用clean?
Everyone should keep the environment(cleaning)?为什么不用clean?

Everyone should keep the environment(cleaning)?为什么不用clean?
keep + doing sth .
固定用法