It was quite a serious mistake, caused by carelessness. A. which I think wasB. I think whi

发布时间:2020-08-17 13:17:01

It was quite a serious mistake,     caused by carelessness.
A. which I think was
B. I think which was
C. which I think it was
D. I think which it was

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A. which I think was
B. I think which was
C. which I think it was
D. I think which it was
解析:which引导非限制性定语从句, I think是插入语 
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