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    17．By the middle of the 1920s the farthest corners of the earth explored. A．are B．were C．have been D．had been 【查看更多】

     

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    By the middle of the 1920s the farthest corners of the earth        explored.

             A．are       B．were      C．have been          D．had been

     

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    By the middle of the 1920s the farthest corners of the earth        explored.

           A．are    B．were C．have been      D．had been

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    By the middle of the 1920s the farthest corners of the earth        explored.

           A．are      B．were     C．have been         D．had been

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    By the middle of the 1920s the farthest corners of the earth        explored.

    A．are          B．were           C．have been           D．had been

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    By the middle of the 1920s the farthest corners of the earth       explored.

    A．areB．wereC．have beenD．had been

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