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：句意：当你在学习弹钢琴时，有一位好老师会有很大的差异。having a good teacher 是动名词做主语，故选B。
考点：考查动名词做主语的用法。