When you’re learning to play the piano, ______

试题详情及答案解析

When you’re learning to play the piano, _______ a good teacher makes a big difference.

A．have	B．having
C．and have	D．if have

答案：B

试题分析：考查非谓语动词。句意：当你在学着弹钢琴的时候，有老师会有很大的影响的。When引导的是一个时间状语从句，动名词短语having a good teacher在句中做主语。故B正确。
考点：考查非谓语动词