— Can you lend me your pen?

— Of course. I have two, and _____ of them write well. [ ]

A. any

B. all

C. both

D. two

处理冒顶封顶后，加密棚距，安设好拉杆，使（）背严背实，成为一体。

A.顶

B.帮

C.棚

D.顶和两帮