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    29、 No one knows for _______ certain what happened, but it’s _______ fair bet that it was not an accident.

       A. /, /       B. /, a       C. the , a        D. a; / 

    29、B

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     No one knows for _______ certain what happened, but it’s _______ fair bet that it was not an accident.

       A. /, /       B. /, a       C. the , a        D. a; / 

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