Air pollution has become__________ than ever before. We must do something to stop it. A. serious B. ...
2023-02-06 14:16:39 92次 2014年初中毕业升学考试（上海卷）英语（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Air pollution has become__________ than ever before. We must do something to stop it.
A. serious B. more serious
C. most serious D. the most serious
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