—May I come in?— A. Come in please. B. It doesn’t matter. C. That’s OK.

问题补充：

—May I come in?

—

A. Come in, please. B. It doesn’t matter. C. That’s OK.

答案：

解析：考查交际用语。意为“我可以进来吗”，回答是 “请进”。B和C都是“没关系”的意思，与问句意思不符。