WE ... EACH OTHER SINCE WE ... AT SECONDARY SCHOOL ....

4 . - BAI KIEM TRA 1 TIET ANH 7
BAI KIEM TRA 1 TIET ANH 7
4 . We ... each other since we ... at secondary school . A . have known - have been . B. have know n - are C . knew - were D . have kmown - were