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这个结构用来表示虽然不必要但却已完成的动作: I needn't have written to him because he phoned me shortly1 afterwards. 我本来不需要给他写信,因为不久之后他就给我打了电话。(但我的确写了,因而浪费了时间。) You needn't have brought your umbrella for we are going by car. 你本来不用带雨伞,因为我们将要坐车去。(但是你却多余地带了伞。) He needn't have left home at 6:00;the train doesn't start till 7:30. 他本不必6点就离开家;火车7点30分才出发。(因此他要等一个小时。) 点击收听单词发音
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