ALTHOUGH HE IS OLD, ________ HE IS VERY ACTIVE.A.BUT B.HOWEVER C.Y...

14. - AV11 KIEM TRA 45 PHUT LAN 4
AV11 KIEM TRA 45 PHUT LAN 4
14. Although he is old, ________ he is very active.A.but B.however C.yet D.No word is needed