Question

Advertisements _______ these facts have been printed in newspapers and magazines but have not
helped much

1. A.
   based on
2. B.
   base on
3. C.
   to base on
4. D.
   basing on

Answer 1

A
考查非谓语动词。based on these facts作定语，修饰advertisements，be based on以……为基础，选A。