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    20、They needn’t have spent so much energy and time testing the materials, most of ________ conform to the requirements.

    A. what          B. whom        C. which        D. them  

    20、C

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    They needn’t have spent so much energy and time testing the materials, most of ________ conform to the requirements.

    A. what          B. whom        C. which        D. them  

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