carriesun99
幼苗
共回答了13个问题采纳率:100% 举报
Based on不是过去式,而是被动式,它与全句的主语this paper构成被动关系,前面省略了being(即开头为being based on...).
这是非谓语动词(或者说独立主格)的一种用法.
把这句话拆成两句的话,就是:
This paper is based on some qualitative and quantitative analyses.
This paper investigates the method of measuring external costs of congestion.
不知道是不是说清楚了^_^
1年前
8