—________, sir.

—Thanks a lot.

A.You're welcomeB.That's all rightC.This way, pleaseD.Sorry, I don't know

【答案】C

【解析】

句意：—打扰一下，老师的办公室在哪里？—_____ —非常感谢。A. You're welcome 不客气，B. That's all right不用谢， C. This way, please请这边走，D. Sorry, I don't know对不起，我不知道。由句子可知C符合句意，故选C。