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    19． life began on the earth is one of the biggest puzzles to scientists. A．How B．What C．Where D．That 【查看更多】

     

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     life began on the earth is one of the biggest puzzles to scientists.

        A．How              B．What             C．Where            D．That

     

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    ______life began on the earth is one of the biggest puzzles to scientists.

           A．How       B．What        C．Where        D．That

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    ______life began on the earth is one of the biggest puzzles to scientists.

           A．How B．What C．Where      D．That

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    26．______life began on the earth is one of the biggest puzzles to scientists.

           A．How B．What C．Where      D．That

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          life began on the earth is one of the biggest puzzles to scientists.

    A．How           B．What           C．Where          D．That

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