Jack is a hard-working boyYes. All of us want to recommend him the Best Student

问题补充：

--- Jack is a hard-working boy.

--- Yes. All of us want to recommend him the Best Student Award.

A. as

B. for

C. to

D. from

答案：

A. as

(答案→)B. for

C. to

D. from

解析：根据题干，本句的意思是“我们一致推荐他为最佳学生。”recommend sb for sth表示“推荐某人为…”，是固定短语。所以本题选B。