单选题
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
【正确答案】
A
【答案解析】
[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。
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