Question

(2010辽宁五校月考) It was quite a serious accident, ________caused by careless driving.

A. which I think was   B. I think which was

C. which I think it was  D. I think which it was

Answer 1

A

解析:

本题考查由which引导的非限制性定语从句，which替代先行词accident 在定语从句中作主语。I think 是插入语，放在which后面。