Question

I really don’t know ______ about it.

A．what to do

B．how to do

C．to do what

D．how can I do

Answer 1

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。