Three men arrested in the city's Chinatown area in connection with a D. C. police undercover investigation of charges that a police officer was offered bribes in exchange for tip-offs on gambling raids there, each pleaded guilty in D. C. Superior Court yesterday to a gambling offense.

The police said in court records that the undercover officer had received $2,480 in bribes between May and September 1977 after he had reported to his superiors that the offers had been made.

The investigation centered on a four-story, red-brick building at 606 H St. NW, the records said.

In a predawn raid at four buildings on H Street NW last September, police seized $16,000 and arrested 20 persons.

Yesterday, Mon Suey-lee, 57, proprietor of a Chinese grocery at 604 H St. NW, pleaded guilty to a felony charge of maintaining a gambling premise. Antonio English Quinanola, 42, of Hyattsville, and Larry Kim Chin, 27, of Silver Spring both pleaded guilty to a misdemeanor charge of maintaining a gambling premise.

The three men, along with Lee's daughter, Margarette Lee, 25, of 1620 Q St. NW and Nelson Liu, an illegal alien, had been charged in an indictment with conspiracy, bribery, police corruption and maintaining a gambling premise, according to Assistant U.S. Attorney James Haney.

Margarette Lee was accepted yesterday into the courts first offender treatment program and the charges against Liu were dismissed, Haney said.