Jack described his father ,who
单项选择题 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：D
答案解析: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。
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