--Peter is this your pen?--Yes it s . Many thanks. I looked for it everywhere.A. mine B

问题补充：

--Peter, is this your pen?

--Yes, it s . Many thanks. I looked for it everywhere.

A. mine B. meC. I

答案：

解析：考查代词的用法。表示“我的”，用物主代词；后面无名词，用名词性物主代词。