Question

he finished his novel in three months，——was something we had not expected。

that
it
which
this
选出正确答案，给出理由和中文意思

Answer 1

He finished his novel in three months，——was something we had not expected。

这道题目选which，这是非限制性定语从句中which的用法，这里which代表整个前面的一句话或一件事情。
该题题意为：他在三个月内完成了他的小说，这（件事情）是我们没用预料到的

Answer 2

which
非限定性定语从句，修饰前面整个句子。
他三个月内就看完了这本小说，我们有点意料不到的

Answer 3

that