The air in Beijing is getting much ______ now than a few years ago.
A．cleanB．cleanerC．cleanestD．the cleanest
B解析:
本句的意思是北京的空氣比幾年前清新多了。故用比較結(jié)構(gòu)，在形容詞或副詞的比較級(jí)前可以用much等詞來(lái)修飾。
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