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

问题补充：

—What do you want to do 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：to put things in表明those old boxes是被用作工具，故选介词with。

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