MARY __________ ABSENT FROM CLASS SINCE YESTERDAY BECAUSE SHE ____...

16. - KIEM TRA 1 TIET LAN 2
KIEM TRA 1 TIET LAN 2
16. Mary __________ absent from class since yesterday because she __________ ill.a. is / is b. has been / was c. was / has been d. has been / has been