问题
How much is _____ for a schoolbag— Experts say students should carry _____ more than 10% of their body weight．
A:too much; 不填
B:much too; no
C:too many; 不填
D:too much; not;
B:much too; no
C:too many; 不填
D:too much; not;
正确答案是：
