HE PASSED THE EXAMINATION ... HE HAD BEEN PREVENTED BY ILLNESS FRO...

24. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

24. He passed the examination ... he had been prevented by

illness from studying.

a. although

b. but

c. however

d. moreover

 a