题目

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   答案： A 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。  

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