题目内容
—Look at the boy running on the playground. Is it Frank?
—It ______ be him. I saw him go to the library just now.
A. mustn’t B. can’t C. needn’t D. might not
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题目内容
—Look at the boy running on the playground. Is it Frank?
—It ______ be him. I saw him go to the library just now.
A. mustn’t B. can’t C. needn’t D. might not