___is done to clean the air.为什么填little不填a little
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![___is done to clean the air.为什么填little不填a little](/uploads/image/z/13719657-57-7.jpg?t=___is+done+to+clean+the+air.%E4%B8%BA%E4%BB%80%E4%B9%88%E5%A1%ABlittle%E4%B8%8D%E5%A1%ABa+little)
___is done to clean the air.为什么填little不填a little
___is done to clean the air.为什么填little不填a little
___is done to clean the air.为什么填little不填a little
little是相当于代词,a little是副词词组
much,enough,many,some都可以这样用
Enogh has been said on how to learn English well.
Much has been done to protect the wildlife.