________ the environment，they have done many things in the past two years. A. To protect B. Protect ...
2022-10-05 16:51:10 81次 新人教版九年级第11-14单元测试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
________ the environment，they have done many things in the past two years.
A. To protect B. Protect C. Protecting D. Protected
本题链接：
