问题
选择题
This is Susan and that is Mary. _ my _ .
A．She's, friend
B．He's, friend
C．They're; friends
D．They're, friend
答案
C
题目分析: 句意：这是苏珊，那是玛丽。She's她是, friend朋友（单数），He's他是, They're;她们是 friends 朋友（复数）。苏珊和玛丽是两个人，都为复数，故选C.