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    These machines ought once a week. A. to be cleaned B. to cleaned C. clean D. be cleaned 【查看更多】

     

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    These machines ought________ once a week.

    A. to be cleaned     B. to cleaned 　　    C. clean  D. be cleaned

     

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    These machines ought________ once a week.

    A. to be cleaned     B. to cleaned 　　    C. clean  D. be cleaned

     

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    These machines ought ________ once a week.

    [　　]

    A．to be cleaned
    B．to cleaned
    C．clean
    D．be cleaned

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