题目内容：
Whose book is it?
A．It's Sam's. B．It's Steven's.
C．It's mine.
参考答案：
答案解析：
单选题：Whose book is it?
- 题目分类：公共英语一级
- 题目类型：单选题
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B．It's Steven's.
C．It's mine.
B．It's Steven's.
C．It's mine.
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