Question

Why not _______a taxi to go home?

1. A.
   taking
2. B.
   take
3. C.
   does take
4. D.
   to take

Answer 1

B
why not表示建议，是why don’t you 的简写，助动词don’t后应跟动词原形，
所以why not后也应该跟动词原形，故B。