I’m interested in how did he do it.

I’m interested in how did he do it.
A、正确
B、错误
正确答案：B
答案解析：这是一个宾语从句，作“be interested in”的宾语。在宾语从句中，要用陈述句语序，即“引导词 + 主语 + 谓语 + 其他成分”。原句“how did he do it”是疑问句语序，应改为“how he did it”，所以该表述错误。