The famous doctor____(operate)on three patients in the past

The famous doctor____(operate)on three patients in the past in the past three past The famous doctor （）（operate）on a special patient in a few d In the past three years the doctor ( operate) on five patients since 3 p.m.yesterday You___a lot in the past three years. operate on sb.in the part of body The famous writer___one new book in the past two years. on the past与in the past有什么区别 为什么是in the past three years而不是over the past three years The doctor will operate on the patient. At half past three in the afternoon the chairman__the meetin