HE HAD TO STAY AT HOME _________ HE WAS ILL.A. SO B. BECAUSE C. AS...

10. - KIEM TRA 45 PHUT TIENG ANH
KIEM TRA 45 PHUT TIENG ANH

10.He had to stay at home _________ he was ill.

a. so b. because

c. as soon as

d. until