问题
选择题
--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
答案：B
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。