问题
who______it be that is knocking at the door? —It_______be Father, but I’m not sure.
A:can, must
B:can, may
C:must, can
D:may, must
B:can, may
C:must, can
D:may, must
正确答案是：
同类题型
I haven’t settled the problem of I’llgo back home during the coming May Day.
I don’t know if I anyone at the party this evening. If I anyone, I will get nervous.
My friend. Tom. kept me_______ for an hour yesterday.
It is such a good place everybodywants to go and visit it is wellknown all over the world