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 考查疑问词加不定式。do是及物动词，必须有自己的宾语。选B的话，do缺少宾语，故选A，what作do的宾语。What to do =" how" to do it。