We should keep the earth _________ and stop _________ it. A.clean; polluting B.to clean; polluting C...
2022-09-02 08:17:14 236次 上海市2019-2020学年七年级上学期期中英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
We should keep the earth _________ and stop _________ it.
A.clean; polluting B.to clean; polluting C.clean; to pollute D.to clean; to pollute
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