He______be in the classroom，I think．
No，he____be in the classroom．I saw him go home a minute ago．（ ）
A．can； may notB．must； may not
C．may； mustn'tD．may； can't
He______be in the classroom，I think．
No，he____be in the classroom．I saw him go home a minute ago．（ ）
A．can； may notB．must； may not
C．may； mustn'tD．may； can't
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