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    Mr. Smith is the only one of those engineers who in China. A. is working B. had been working C. are working D. have been working 【查看更多】

     

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    Mr Smith is the only one of those engineers who ________ in China.

    [　　]

    A．is working　　　　　B．had been working

    C．are working　　　　 D．have been working

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