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    19、I _________ have written to him because he would come back as he informed us.

    A. couldn't          B. ought to            C. must                D. needn't

    19、D

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    I _____________ have written to him because he would come back as he informed us.

         A. couldn't          B. ought to            C. must                D. needn't

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    科目：高中英语 来源： 题型：

    I _________ have written to him because he would come back as he informed us.

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