问题
Smith was overweight, so the doctor urged that not only _______ have less fat and meat,but also he _______.
A:should he; take exercise
B:must he; takes exercises
C:he can; does some exercises
D:he ought to; do some practice
B:must he; takes exercises
C:he can; does some exercises
D:he ought to; do some practice
正确答案是：
