If you live in Changchun, you may notice that the air in winter is not as _______as it is during the...
2022-05-20 17:13:15 171次 2020年吉林省长春市宽城区中考一模英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
If you live in Changchun, you may notice that the air in winter is not as _______as it is during the summer.
A.clean B.cleaner C.cleanest D.cleaning
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