Jack described his father,who_______a brave boy many years ago,as a strong-willed man．
- A.would be
- B.would have been
- C.must be
- D.must have been
正确答案及解析
正确答案
D
解析
本题考查情态动词的用法。句意：杰克把他的父亲描述为一个意志坚定的人，他的父亲多年前肯定很勇敢。用must have been表示对过去事情的肯定推测。
