--My father a letter yesterday but I’m not sure if he has finished it.-Why not ask hi

问题补充：

--My father a letter yesterday, but I’m not sure if he has finished it.

---Why not ask him about it ?

A. wrote

B. was writing

C. has written

D. writes

答案：

A. wrote

(答案→)B. was writing

C. has written

D. writes

解析：考查时态。句意：结合下文，我不确定他是否已经完成了。可知上文意思是，我的父亲昨天正在写一封信。描述过去正在进行的动作，用过去进行时态。故选B。