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It was such a serious mistake ,______caused by carelessness!

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It was such a serious mistake ,______caused by carelessness!
A.which I think was B.which I think was
C.I think which was D.I think which it was
which I think it was
选A.我认为,这是个由粗心导致的严重的错误.
很显然,后面的句子是一个非限制性定语从句,所以肯定由which引导,以which开头,所以排除C和D.I think是个插入语.which关系代词就代替了主语problem,所以不需要再有主语it,所以排除B.
It was such a serious mistake,_____ caused by carelessness. it was quite a serious mistake,____caused by carelessness. Tt was such a serious mistake.i think which was caused by ca I was in such a hurry that I took my sister’s bag by mistake (单词拼写)It was c___ of you to make such a silly mistake. 帮帮忙翻译成中文1. It was foolish of her to make such a mistake . 翻译 It looks ______you've made a serious mistake. You __ such a serious mistake if you had followed his advice You ___ such a serious mistake if you had followed his advic It is ausual mistake made by a It is a usual mistake made by It was stupid of her to make such a mistake.动词不定式是句子的什么成分?