Question

(2010遼寧五校月考) 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:

本題考查由which引導的非限制性定語從句，which替代先行詞accident 在定語從句中作主語。I think 是插入語，放在which后面。