the help of my teacher I worked out the problem in the end.A. UnderB. OnC. withD. For

问题补充：

the help of my teacher, I worked out the problem in the end.

A. Under

B. On

C. with

D. For

答案：

A. Under

B. On

(答案→)C. with

D. For

解析：句意：在老师的帮助下，我最终算出了这道题。With the help of sb意为“在某人的帮助下”；为以固定短语；故选C。