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    I don’t know _________.
    A．what to do it B．how to do it C．what to do D．to do what
    C
    考查疑问词+不定式。what to do中，what作do的宾语，A项it多余，排除A；D项的疑问词应该放前面，排除D。 how to do中缺少宾语，排除B。故选C。
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