—What do you want those old boxes?—To put things in when I move to the new flat.A. byB.

问题补充：

—What do you want those old boxes?

—To put things in when I move to the new flat.

A. by

B. for

C. of

D. with

答案：

A. by

B. for

C. of

(答案→)D. with

解析：with的意思是：用以表示使用的工具或器具。