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    21．( )一What should we do first if we want to develop our village? 一A lot of new roads ．I think． A．must build B．have to build C．must be built D．have built 【查看更多】

     

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    一What should we do first if we want to develop our village?

    一A lot of new roads __________．I think．

    A．must build     B．have to build          C．must be built         D．have built

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