问题补充：
－This is my friend, Leo.
－
A. Thank you.
B. I’m fine. And you?
C. Nice to meet you.
D. Not at all.
答案：
A. Thank you.
B. I’m fine. And you?
(答案→)C. Nice to meet you.
D. Not at all.
解析：Thank you.谢谢你；I’m fine. And you?我很好，你呢？Nice to meet you.很高兴见到你；Not at all.一点也不。根据上文，这是我的朋友，里奥。结合语境可知选C.
