We must try our best ________ pollution ________again. A. to stop; happen B. to stop; from happening...
2022-10-22 20:59:07 56次 2018年秋九年级英语冀教版：Unit 3过关测试 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
We must try our best ________ pollution ________again.
A. to stop; happen
B. to stop; from happening
C. stopping; happening
D. stopping; happen
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