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