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What do Hamlet and the ghost require Marcellus and Horatio to swear to?
That they will not reveal to anyone that they have seen the ghost.
That they will not reveal to anyone that Claudius poisoned King Hamlet.
That they will assist Hamlet in exacting revenge on Claudius.
That they will follow Claudius and report their observations to Hamlet.
That they will only reveal what they have seen to Gertrude.