—Would you mind opening the window? — Please do.A .Certainly not B. You’d better not C. I

问题补充：

—Would you mind opening the window?

— Please do.

A .Certainly not B. You’d better not C. I’m afraid so

答案：

解析：句意：--你介意开窗户吗？--当然不，开吧。A. 当然不 B. 最好不要 C. 恐怕不行。在答句中please do可以判断是不介意的。题中短语mind doing 介意做某事。故选A.