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

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• Jack described his father,who _____a brave boy many years ago,as a strong-willed man.答案给的是must have been.答案是没错,的确合情合理说的过去.可是选项中还有must be 为什么不行?有人说must be是对现在的推测,可是从语法角度看填must be 没有任何错误,为什么不能填must be?句子中有many years ago存在,那么和must be用在一起,也是表示对过去的推测.
• 3.I( )have watched that movie—it`ll give me horrible dreams A.shouidn`t B.needn`t C.couldn`t D.mustn`t4.Jack described his father ,who()brave boy many years ago,as a strong-willed man.A.would be B.would have been C.must be D.must have been5.--Sorry.Professor Smith ,I didn`t finish the assignment yesterday.--Oh,you()have done it as yesterday was the deadline.A.must B.mustn`t C.should D.shouldn`t如果只给答案不写原因的就免了
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• Jack described his father,who _____a brave boy many years ago,as a strong-willed man.
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