My son wants a pet rabbit for long but I have no time to buy for him.A. it B. that C. on

问题补充：

My son wants a pet rabbit for long, but I have no time to buy for him.

A. it B. that C. one

答案：

解析：考查it和one的区别。句意为“我儿子想要个宠物兔子很久了，但我没有时间为他买一个。”it指代同一个事物，one指代同类事物中的一个，故选C。