ALTHOUGH HE TRIED HARD, ………A. BUT HE FAILED B. YET HE FAILEDC. HOWE...

5. - DE KIEM TRA TIENG ANH 12 8
DE KIEM TRA TIENG ANH 12 8

5. Although he tried hard, ………

a. but he failed

b. yet he failed

c. however he failed

d. he failed