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    21．( )--Why didn't you go to the Dinosaur Park with us? --Because I there twice． A．am B．had been C．have been D．had gone 【查看更多】

     

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    ——Why didn't you go to the Dinosaur Park with us?

    ——Because I       there twice．

    A．am    B．had been    C．have been    D．had gone

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