No one tell us ＿＿¸so we need your help.A how should we do.B what should we doC how to do it D what to do it

No one tell us ＿＿¸so we need your help.A how should we do.B what should we do
C how to do it D what to do it

C
宾语从句是陈述语序,故排除A与B,而D错的原因是多了一个IT