这里的fast是形容词.fast既可以作为形容词,又可以作为副词.如果fast是副词,就应该这样用：It‘s running fast.形容词跟在be动词（am,are,is）后面,副词一般跟在动词后面.希望对你有所帮助.
It's fast.中fast做副词是吗?
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