Simon is crazy about playing video games;now he must be on his computer,__?填反义疑问句.

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Simon is crazy about playing video games;now he must be on his computer,__?填反义疑问句.
Simon is crazy about playing video games;now he must be on his computer,__?填反义疑问句.

Simon is crazy about playing video games;now he must be on his computer,__?填反义疑问句.
now he must be on his computer,isn't he?
因为must be 表推测