Lishen!Is Tom singing in the classroom?No,it __ be Tom.He has gone to Paris.Lishen!Is Tom singing in the classroom?No,it __ be Tom.He has gone to Paris.A.mustn't B.needn't C.can't D.may not 请问选哪儿一个?为什么?

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Lishen!Is Tom singing in the classroom?No,it __ be Tom.He has gone to Paris.
Lishen!Is Tom singing in the classroom?
No,it __ be Tom.He has gone to Paris.
A.mustn't B.needn't C.can't D.may not
请问选哪儿一个?为什么?

c
mustn't 的意思是禁止
can't意思是不可能