Question

I met this guy _____ some other occasions but he did not seem to recognize me

1. A.
   for
2. B.
   on
3. C.
   at
4. D.
   in

Answer 1

B
考查介词。on some occasions 固定用法，意思是“在一些场合，在某些情况下”。句意：我在某个场合遇到这个家伙，但他看起来不认识我。