问题
It was quite a serious mistake, ____caused by carelessness.
A:which I think was
B:I think which was
C:which I think it was
D:I think which it was
B:I think which was
C:which I think it was
D:I think which it was
正确答案是：
同类题型
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It’s a pity that I failed. But I am sure I will make it if I am given another .
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