—Sorry, Miss Liu. I forgot __________ my homework to school.
— __________ so careless, Sandy.
A:to bring; Don't be
B:to bring; Not be
C:bringing; Don't be
D:bringing; Not be
下列有关催化剂的说法中,错误的是( )
推理是化学学习中常用的方法.下列推理正确的是( )