–Do you learn maths ______ asking the teacher _____

试题详情及答案解析

–Do you learn maths ______ asking the teacher ______ help?
--Oh, yes. It helps a lot.

A．for; by	B．to; by
C．by;for	D．by;to

答案：C

试题分析：句意：—你经常通过向老师寻求帮助来学习数学吗？—哦，是的。这样帮助很大。by+doing通过做某事；ask sb for help向某人寻求帮助。故选C。
考点:考查介词的用法。