WHEN THEY ( COME)….TO THE STATION, THE TRAIN ALREADY ( LEAVE)…..A....

97. - BAI TAP LUYEN VE TENSE
BAI TAP LUYEN VE TENSE
97. When they ( come)….to the station, the train already ( leave)…..a. came- had already left b. came- left c. came- has already left d. came- was already leaving