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it was quite a serious mistake,____caused by carelessness.

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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