"Here hung those lips that I have kiss'd I know not how ___": Hamlet (3)

I believe the answer is:

oft

(Other definitions for oft that I've seen before include "Many times (archaic)" , "''... in the stilly night'' (Moore melody)" , "Consistently" , "Many times, of old" , "Old song'... in the stilly night'" .)

I've seen this clue in The New York Times.

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