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    21．---He has got idea．He lets his sister go with him．---That’s good idea．A．a,an B．a,a C．an,a D．an,an 【查看更多】

     

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    ---He has got ________ idea．He lets his sister go with him．

    ---That’s ________ good idea．

    A．a；an              B．a；a                C．an；a                 D．an；an

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