Question

I don't know ____________.A how to do it B what to do it C what I should do it D what I should do

Answer 1

how是“怎么”，后要加一个宾语“it”，what是“什么”，后不用加宾语。所以是AD拉！按我们老师说的，就是把它变成陈述句，比如D，变成陈述句就是I
should
do
what，讲得通吧！而C,I
should
do
it
what,有两个宾语~

Answer 2

I
don't
know
与
what
to
do
或者是
how
to
do
it
连用。
C错在
多个it.
选A和D