I really don’t know ______ about it.
A．what to doB．how to doC．to do whatD．how can I do
A
A 考查疑問詞加不定式。do是及物動詞，必須有自己的賓語。選B的話，do缺少賓語，故選A，what作do的賓語。What to do =" how" to do it。
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