BY THE TIME I APPLIED, ALL THE HOLIDAY VOUCHERS ______ USED UP.A....

Lớp 12 Tiếng Anh ĐỀ THI HỌC SINH GIỎI MÔN ANH VĂN LỚP 12 PPT

34. By the time I applied, all the holiday vouchers ______ used up.A. had been B. have been C. were being D. were