Relax yourself every day,________ you'll be too tired to get good grades.

Relax yourself every day, ________ you'll be too tired to get good grades.

A. and            B. or            C. for             D. but    

Relax yourself every day,________ you'll be too tired to get good grades.

A．and              B．or               C．for               D．but

Relax yourself every day,________ you'll be too tired to get good grades.

1. A.
   and
2. B.
   or
3. C.
   for
4. D.
   but

Relax yourself every day,________ you'll be too tired to get good grades.