单选题 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】[解析] 考查情态动词。must have done表示对过去的肯定推测。句意为：杰克将他的父亲描述成一个意志刚强的人，许多年前他的父亲一定是一个勇敢的孩子。