---Excuseme,wherearethebooksthatyouboughtyesterday?    ...

问题详情：

--- Excuse me, where are the books that you bought yesterday?

        --- Oh, they are not _________. We bought them for the students as presents.

        A. mine       B. ours      C. yours      theirs

【回答】

B

知识点：物主代词

题型：选择题