一道英语选择题.请帮忙分析,谢谢!
The boy in the classroom____be David.
That______be him.I saw him in the playgroud just now.
A.may,mustn't
B.must,mustn't
C.can,can't
D.must,can't
请选出正确选项,并详细分析它们,非常感谢!
是否可以选C?请指正!谢谢!