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
在否定句中连接并列成分时只能用or，而不用and；当how与不定式连用时，后面必须带有宾语。