题目内容
一I just saw Peter in the library.
—It _______ be him. He is studying in the classroom.
A. needn't B. mustn't C. shouldn't D. can't
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题目内容
一I just saw Peter in the library.
—It _______ be him. He is studying in the classroom.
A. needn't B. mustn't C. shouldn't D. can't