题目内容


It was a serious mistake, ______ caused by carelessness.
A．which I think wasB．which I think it was
C．I think which wasD．that I think it was
A
考查定语从句。句中I think为插入语，先行词为a serious mistake，在从句中作主语。句意：它是一个严重的错误，我认为是有粗心引起的。
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