Question

I don’t know ________.

1. A.
   how to say or do
2. B.
   what to say or do
3. C.
   what to say and to do
4. D.
   how to say and to do

Answer 1

B
在否定句中連接并列成分時(shí)只能用or，而不用and；當(dāng)how與不定式連用時(shí)，后面必須帶有賓語。