The old man kept one black cat and two white .A. oneB. onesC. thoseD. one’s

问题补充：

The old man kept one black cat and two white .

A. one

B. ones

C. those

D. one’s

答案：

A. one

(答案→)B. ones

C. those

D. one’s

解析：cat是可数名词，且前面有two修饰，ones指代cats。