He worked hard to some money for his retirement.A. set aboutB. set outC. set offD. set as

问题补充：

He worked hard to some money for his retirement.

A. set about

B. set out

C. set off

D. set aside

答案：

A. set about

B. set out

C. set off

(答案→)D. set aside

解析：“他努力工作为的是为退休攒点钱。”A. set about 开始做B. set out出发 C. set off 使爆炸D. set aside存储，答案D。