THEY HAVE TWO SONS,____________IS LIVING IN CANADA.A.ALL OF THEM B....

19- - AV11 KIEM TRA 45 PHUT LAN 4
AV11 KIEM TRA 45 PHUT LAN 4
19-They have two sons,____________is living in Canada.A.all of them B.both of whom C.one of them D.either of whom