31．It was quite a serious accident, caused by careless driving. A．which I think was B．I ——青夏教育精英家教网—

摘要：31．It was quite a serious accident, caused by careless driving. A．which I think was B．I think which was C．which I think it was D．I think which it was

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It was quite a serious accident, caused by careless driving.

A．which I think was B．I think which was

C．which I think it was D．I think which it was

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It was quite a serious accident，________caused by careless driving.

A．which I think was　

B．I think which was

C．which I think it was

D．I think which it was

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