This dress is twice as expensive as that one. 第二个as是介词还是关系副词?
第1个as为副词
第2个as为连词,在否定句可以用so替换,用来引导比较状语从句
This dress is twice as expensive as that one (is expensive)
这件衣服是那件衣服的2倍贵.
例如: Tom is not so tall as Jack (is tall)
This rope is three times as long as that one (is long)
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