I just saw Peter in the library．
It _______ be him． He is studying in the classroom．（ ）
A．needn'tB．mustn'tC．shouldn'tD．can't
I just saw Peter in the library．
It _______ be him． He is studying in the classroom．（ ）
A．needn'tB．mustn'tC．shouldn'tD．can't
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