Our home river, Yitong River used to __________ seriously, but now it's as clear as a mirror. A.poll...
2022-08-16 03:00:16 23次 2019年吉林省长春市省第二实验学校中考一模英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
Our home river, Yitong River used to __________ seriously, but now it's as clear as a mirror.
A.pollute B.polluting C.is polluted D.be polluted
本题链接：
