问题
Someone is knocking at the door. Who may it be? —It ______ be Tom. He is still in the school.
A:can’t
B:mustn’t
C:couldn’t
D:may not
B:mustn’t
C:couldn’t
D:may not
正确答案是：
同类题型
Mary often helped her mother ________ out the trash last year.
It is quite patient ______ him to explain everything ______ me.[ ]
How often do you visit your grandma in the village? —-I feel ashamed.______________.
The story is very interesting, so most of us like it.
Please don’t make a noise.— _______I’ll be as quiet as a mouse.