Air pollution has become ______ than ever before. We must do something to stop it.

题型：单选题题类：常考题难易度：容易

2016年全湖北省2017届九年级英语专题练习：形容词的比较级和最高级

A、serious B、more serious C、most serious D、the most serious

举一反三

— I think Bob did _______ than other two.

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—Lily. She is much .

—Yes, but she is ________ than Sally.

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