—Is this Mr.White’s office Mary?—Yes .A. that’s all rightB. it doesn’t matter C. after y

问题补充：

—Is this Mr.White’s office,Mary?

—Yes,.

A. that’s all right

B. it doesn’t matter

C. after you

D. please yourself

答案：

A. that’s all right

B. it doesn’t matter

(答案→)C. after you

D. please yourself

解析：after you!“您请！”是接待客人时的礼貌用语。根据语境，C项正确。