I don’t know _________.
A．what to do it B．how to do it C．what to do D．to do what
C
考查疑問(wèn)詞+不定式。what to do中，what作do的賓語(yǔ)，A項(xiàng)it多余，排除A；D項(xiàng)的疑問(wèn)詞應(yīng)該放前面，排除D。 how to do中缺少賓語(yǔ)，排除B。故選C。
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