么手段让大木岩松睡着，然后犯人再通过别的途径拿到房间钥匙进入房间行凶……

讲道理，第二种可能性极小，毕竟能让大木岩松睡着，那么要他性命就不需要这么麻烦还进入房间杀人，所以高远倾向第一种可能。

结合这种情况，犯人的身份局限性就已经很大了。

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