为什么这里的he had 不需要主谓倒置语序？请老师们指点一下.谢谢!
The inspector asked at what time he had arrived at the station.
at what time用以引导宾语从句，等于when引导的宾语从句，即：
The inspector asked whenhe had arrived at the station.
又如：
Please tell me at what time he can come. = Please tell me when he can come.