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    21、On the east of the hill    a deserted mine，which they used as their temporary habitat．

        A．the researchers found                                 B．found the researchers

        C．did the researchers find                              D．have the researchers found

     

     

    21、A

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    On the east of the hill    a deserted mine，which they used as their temporary habitat．

        A．the researchers found                                 B．found the researchers

        C．did the researchers find                              D．have the researchers found

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