Question

-Did you walk to school this morning?

-No, we went by bus ________．

1. A.
   instead of feet
2. B.
   instead walking
3. C.
   instead of on foot
4. D.
   instead on foot

Answer 1

C
instead是副词；instead of是介词，on foot作其介词宾语，因此选择C项。又如：I would love to stay at home instead of going out。我想待在家中而不出去。