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

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：考查交际用语。that’s all right不用谢，it doesn’t matter 没关系，after you您先走（礼让对方“先走”时所用的话）please yourself请自便，句意：玛丽这是怀特先生的办公室吗？是的，您先走。故选C。