Simple sails were make from canvas _____ over a frame A. was stretched B. a stretch C. it was stretched D. stretched

Đáp án D

Dạng câu rút gọn mệnh đề: động từ chủ động -> V_ing động từ bị động -> V_ed

Câu đầy đủ: Simple sails were make from canvas which was stretched over a frame.

=> Rút gọn: Simple sails were make from canvas stretched over a frame.