MARY ________ HER HOMEWORK WHEN WE ARRIVED SO WE ALL WENT OUT FOR...

26) - DE THI TRAC NGHIEM TA CHUẨN
DE THI TRAC NGHIEM TA CHUẨN
26) Mary ________ her homework when we arrived so we all went out for the evening.A. had been finished B. was being finishing C. had finished D. was finished