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。