Yesterday our headmaster made a speech ______ environmental protection, and we learned something abo...
2022-07-04 12:37:21 124次 2020年湖南省常德市中考一模英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Yesterday our headmaster made a speech ______ environmental protection, and we learned something about recycling of waste.
A. on B. at C. to
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