Sam’s cousin a programmer. But he changed his job last month.A. has beenB. is going to be

问题补充：

Sam’s cousin a programmer. But he changed his job last month.

A. has been

B. is going to be

C. is

D. used to be

答案：

A. has been

B. is going to be

C. is

(答案→)D. used to be

解析：根据But he changed his job last month.可知，本句的意思是“萨姆的表弟以前是一个程序是师。”所以本句应该是一个过去时，选项中只有D。used to表示“过去常常”。所以本题选D。