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    the dinosaurs disappeared still remains a mystery. A. whether B. that C. if D. Why 【查看更多】

     

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    . ____________ the dinosaurs disappeared still remains a mystery.

       A. whether        B. that           C. if             D. Why

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          the dinosaurs disappeared still remains a mystery.

       A. whether        B. that           C. if             D. Why

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     the dinosaurs disappeared still remains a mystery.

       A. whether        B. that           C. if             D. Why

     

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