the help of the teacher he became a good student.A. UnderB. OnC. WithD. In

问题补充：

the help of the teacher,he became a good student.

A. Under

B. On

C. With

D. In

答案：

A. Under

B. On

(答案→)C. With

D. In

解析：句意：在老师的帮助下，他成为了一名好学生。Under在……下面；On在……上面；With带有，伴随；In在里面。短语with the help of……在……的帮助下，故选C。