摘要： It was such a serious mistake, caused by carelessness. A. which I think was B. which I think it was C. I think which was D. I think which it was
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It was
such a serious mistake, ________ caused by carelessness.
A．which I think was
B．which I think it was
C．I think which was
D．I think which it was
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It was such a serious mistake, ________ caused by carelessness.
A．which I think was
B．which I think it was
C．I think which was
D．I think which it was
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It was such a serious mistake, ________ caused by carelessness．
[ ]
A．
which I think was
B．
which I think it was
C．
I think which was
D．
I think which it was