题目内容
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
答案:A
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题目内容
It was such a serious mistake, ________ caused by carelessness.
which I think was
which I think it was
I think which was
I think which it was