问题补充：
----Hi, Millie. This is my sister, Sandy. ---.
A. Hi, Sandy. Nice to meet you.
B. Are you Sandy?
C. All right, Sandy
D. Sandy? I don’t know you .
答案：
(答案→)A. Hi, Sandy. Nice to meet you.
B. Are you Sandy?
C. All right, Sandy
D. Sandy? I don’t know you .
解析：句意：嗨，米莉。这是我姐姐桑迪。嗨，桑迪。见到你很高兴。当别人向你引荐其他好友时，多用“Nice to meet you！”来回答。故选A。
