— Hi Mary. Could you lend your pen?— Sorry I’m using it.A. IB. meC. myD. mine

问题补充：

— Hi, Mary. Could you lend your pen?

— Sorry, I’m using it.

A. I

B. me

C. my

D. mine

答案：

A. I

(答案→)B. me

C. my

D. mine

解析：借给某人某物可用lend sb sth，某人在动词后用人称代词宾格，故本题选B。