iIt took me two weeks to finish reading the novel written by Mark Twain.为什么用written

题目

iIt took me two weeks to finish reading the novel written by Mark Twain.为什么用written
为什么用written 而不用 was written

答案

这里的written 是过去分词作定语.
如果用was written 则构成定语从句,应该是这样的：
It took me two weeks to finish reading the novel 【that was written 】by Mark Twain.