Have you ever wondered why some of the smartest students in your class sometimes ________ failing exams?

Have you ever wondered why some of the smartest students in your class sometimes ____ failing exams?

         A．take up            B．pick up      C．come up     D．end up

Have you ever wondered why some of the smartest students in your class sometimes ________ failing exams?

1. A.
   take up
2. B.
   pick up
3. C.
   come up
4. D.
   end up

Have you ever wondered why some of the smartest students in your class sometimes ____ failing exams?

       A．take up          B．pick up    C．come up   D．end up

Have you ever wondered why some of the smartest students in your class sometimes ____ failing exams?

A．take up          B．pick up        C．come up        D．end up