答案A
分析：两个as中是原级副词,就是副词的原级比较,也意为“和……一样”.as…as…既用于肯定句,也用于否定句,但在否定句中还可以用so．as…(不能用于肯定句),意为“不如”(不能解释为“和……不一样”).fast既是形容词也是副词.
A taxi doesn't run as________as an underground train．
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