问题补充：
Many students believe the choice of their courses and universities should their own interest.
A. be based on
B. base on
C. be basing on
D. base at
答案：
(答案→)A. be based on
B. base on
C. be basing on
D. base at
解析：句意：许多学生相信他们对于课程和大学的选择应该依靠他们的兴趣。base on以……依据，choice与base on是被动关系，故选A。
