If you have questions you should ask the teacher help.A. fromB. onC. forD. to

问题补充：

If you have questions,you should ask the teacher help.

A. from

B. on

C. for

D. to

答案：

A. from

B. on

(答案→)C. for

D. to

解析：根据题干，本句的意思是“如果你有问题，你应该向老师寻求帮助。”ask sb. for help表示“想某人寻求帮助。”是固定用法。所以本题选C。