问题
Look at the boy running on the playground. Is it David? —It ______ be him. I saw him go to the teachers’ office just now.
A:mustn’t
B:can’t
C:couldn’t
D:must
B:can’t
C:couldn’t
D:must
正确答案是：
同类题型
Do you know _______ the girl in red is?—I’m not sure. Maybe a doctor.
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