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    , Bell’s tetrahedron shape has proved invaluable in the design of bridges. A. To be stable B. Being stable C. Stable D. Having been stable 【查看更多】

     

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    ______, Bell’s tetrahedron shape has proved invaluable in the design of bridges.

       A. To be stable                                     B. Being stable

       C. Stable                                             D. Having been stable

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