—Do you think I could borrow your pen?
—___________.
A. Yes, you may borrow B. Yes, you could
C. Yes, go on D. Yes, help yourself
D
解析 句意：考查常用日常交际用语。句意：——我可以借你的铅笔吗？——是的，请自便。根据题干Do you think I could borrow your pencil？我可以借你的铅笔吗？可知如果是肯定回答，可以用Yes，you may，或Yes，you can。could在答语中常用can来代替。go on继续，help yourself请自便，结合选项，故选D.
B. give