—Only once .
—Sorry, he ____ Beijing, and he ____ the city for three days.
—He Shanghai on business.
have gone to; have been to; have been in
——Because they a place for a study trip.
—He the library.
—No, it ___________be her. She has ___________to Beijing on business.
—He ________ Beijing. He will come back next month.
—He ________ Longquan Mountain in Danzhai. He ________ there three times because he enjoys the local scenery.