Question 22: the document ……….by a professional translator last semester.

A. translated                B. was be translated                 C. has translated             D. was translating

- Cấu trúc: S + was/were  + V-pp + by Obị động quá khứ đơn

- Chủ ngữ: the document  was +V3/ed

- Dấu hiệu: by a professional translator

Dịch: Katherine đang viết 1 bài luận khi có ai đó gõ cửa