本句话的完整版为：They live a happier life than they lived a life before.
很明显,此处的did就代表了live a life,在英语表达中常常避免不必要的重复,用适当的词语进行代替.
名词性代替词,如that,it
动词就有do的几种形式,也有可以省略的
比如：I am taller than he/him. 如果是he,后边的is就是省略了的,him,此处的than即是一个介词词性.
英语中的代词疑问They live a happier life than they did before .这里的di
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