Jack described his father, who______a brave boy many years ago, as a strong-willed man.

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问题 Jack described his father, who______a brave boy many years ago, as a strong-willed man.

选项 A、would be
B、would have been
C、must be
D、must have been

答案D

解析 此处表示对过去事实把握较大的肯定推测,所以用must have been“一定是”。
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