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    16、It was announced that ____ Chinese scientists had been able to create ____ chemical element that could fight cancer cells.

    A. 不填; 不填     B. the; a     C. the; the     D. 不填; a

    16、D

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    It was announced that ____ Chinese scientists had been able to create ____ chemical element that could fight cancer cells.

    A. 不填; 不填     B. the; a     C. the; the     D. 不填; a

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