Question

Planes, cars and trains are used ______ business people ______ traveling.

1. A.
   by; for
2. B.
   by; by
3. C.
   for; for
4. D.
   for; by

Answer 1

A
be used by后常接人，表示“被某人用来”；be used for后接v.-ing形式，表示“被用作……”。