2005福建，33） When_______help, one often says “Thank you.” or “It’s kind of you”.

A. offering    B. to offer 　 C. to be offered    D. offered

When ________ help，one often says“Thank you．”or“It's kind of you．”（2005福建，33）

1. A.
   offering
2. B.
   to offer
3. C.
   to be offered
4. D.
   offered