All the essays , the teacher sent the students home.
A. having written and collected
B. having been written and collected
C. being written and collected
D. to be written and collected
网友回答
A. having written and collected
(答案→)B. having been written and collected
C. being written and collected
D. to be written and collected
解析：本题考查独立主格结构。“所有的文章被写完和收集后”。因此选B。