题目内容

We are sure one day the air in Beijing will be much ______ than today.
A．cleanB．cleaner
C．cleanestD．the cleanest
B

试题分析：句意：我们确信有一天北京的空气比今天会清洁得多。形容词的一种句式：much +比较级+than，意思是“比……得多”，故选B。
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