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

試題分析：句意：我們確信有一天北京的空氣比今天會清潔得多。形容詞的一種句式：much +比較級+than，意思是“比……得多”，故選B。
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