Question

How stupid ________ his advice!

1. A.
   it is for us not to take
2. B.
   of us not to take
3. C.
   it is for us not taking
4. D.
   of us not taking

Answer 1

B
是用介词for还是of引出不定式的逻辑主语主要由它前面的形容词决定，表事物性质的形容词如possible，necessary，important，etc．用for，表示人的特点的形容词如kind，brave，clever，etc．用of。