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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 【查看更多】

     

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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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    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

    查看答案和解析>>


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