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
考查定語從句。句中I think為插入語，先行詞為a serious mistake，在從句中作主語。句意：它是一個嚴重的錯誤，我認為是有粗心引起的。
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