He was so poor that he couldn't afford a new coat.A. to buy his sonB. buy for his sonC. b

问题补充：

He was so poor that he couldn afford a new coat.

A. to buy his son

B. buy for his son

C. buying for his son

D. his son to buy

答案：

(答案→)A. to buy his son

B. buy for his son

C. buying for his son

D. his son to buy

解析：afford (to do )sth意为:买得起.