It has been laid down that each student must a composition to the teacher once a week.A.

问题补充：

It has been laid down that each student must a composition to the teacher once a week.

A. turn in

B. give up

C. put forward

D. bring out

答案：

(答案→)A. turn in

B. give up

C. put forward

D. bring out

解析： turn in(=hand in) 上交。