How to keep the homeless with food and clothing is still under discussionA. supplyingB.

问题补充：

How to keep the homeless with food and clothing is still under discussion．

A. supplying

B. supplied

C. being supplied

D. to be supplied

答案：

A. supplying

(答案→)B. supplied

C. being supplied

D. to be supplied

解析：句意：怎样给无家可归的人提供食物和衣服这个问题正在被讨论。“无家可归的人”和“提供”之间是被动关系，故用过去分词，选B。