Advertisements these facts have been printed in newspapers and magazines but have not
helped much.
A. based on
B. base on
C. to base on
D. basing on
网友回答
(答案→)A. based on
B. base on
C. to base on
D. basing on
解析：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。