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    18、He failed the mid-term exam and only then ______ how much time he had wasted.

       A. he realized              B. did he realize          

       C. he had realized       D. had he realized

     

     

    18、B

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    He failed the mid-term exam and only then ______ how much time he had wasted.

       A. he realized              B. did he realize          

       C. he had realized       D. had he realized

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