— I think I have made a great mistake.
— ____________

选择一项：

A.
I don.t think so. You really made an error.


B.
I don.t think so. It.s really terrible.


C.
I don.t think so. It.s not your fault.

解析：本题是考核“修改信息”的交际用语, 前者说自己犯了严重的错误，后面的3个回答都用了“I don't think so”进行回答，表示不认为如此。但只有C表示“这不是你的错”，与“I don't think so”呼应，其他的答案均与之矛盾。所以答案是C。 正确答案是：I don't think so. It's not your fault.