1. -Can I ask you a few questions now, Mr Smith?
______, but I'll be free this afternoon.
A. Certainly B. No problem
C. I'm afraid not D. You are welcome
2. -Can I help you,sir?
______. I'm being served.
A. Oh, you're a nice girl
B. All right
C. That's very kind of you
D. Thank you all the same
麻烦说明一下原因！

1,选C.
从后面的but I'll be free this afternoon.答语来看，前面应该是否定的意思，也就是下午你可以问我问题，所以前面的答语应是‘现在恐怕不行’。
2，选D.
这是一道口语题，后面的I'm being served.一句说明‘我现在有人服务了，不需要你的帮助了’。因此，前面应是谢绝的语句。Thank you all the same一句的意思是‘不管怎样都要谢谢你’。