the owner must be a boy(否定) the owner——be a boy

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the owner must be a boy(否定) the owner——be a boy

the owner must be a boy(否定) the owner——be a boy
the owner must be a boy(否定) the owner——be a boy

the owner must be a boy(否定) the owner——be a boy
在这里must是表推测的 拥有着一定是个男孩
因此否定 也是表推测 肯定不是 所以只能用can't
The owner can't be a boy.
希望能够帮到楼主

mustn't

the owner can't be a boy