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
网友回答
A. would be
B. would have been
C. must be
(答案→)D. must have been
解析:根据语境可知,此处表示的是对过去事实的推测,所以用must have done结构。注意句中有一个非限制性定语从句将主句分隔开了。