it was quite a serious mistake,____caused

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it was quite a serious mistake,____caused by carelessness.
1.which i think was
2.i think which was
which i think to have
4.i think which to be

选1.which I think was
本题考查定语从句，关系代词which要紧跟着先行词mistake，故先排除2和4,其次"I think"在句中做插入语，可以省略，你就看得更清楚了：it was quite a serious mistake,which was caused by carelessness.因此排除3

1.which i think was
which引导的非限定定语从句，引导词一定要放在定语从句的最前面

1 答案

1 非限制性定语从句，由which引导

1 是对的

it was quite a serious mistake,____caused 3. It ___ quite a few years ___ the accused was declared innocent and set free. It has quite a lot multimedia functions. it 's quite a treat,是什么意思 It was quite different from what I expected. she ias quite a different girl__she was five years ago. it was a blast是什么意思? it was a fashionable curiosity It takes quite a while to understand such people It benefits us quite a lot. 这句有问题吗？