题目内容
---Look at the boy running on the playground. Is it David?
---It ______ be him. I saw him go to the teachers’ office just now.
---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
根据后文的内容,可知为否定的选择为B
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