The man showed the boy__________ he should play the piano.

The man showed the boy__________ he should play the piano.
A、what
B、when
C、which
D、how
【正确答案】：D
【题目解析】：本题考查疑问代词的选择。主句的谓语动词show“展示，显示”用来说明how“怎样”最为合适。