at what time will he 为什么前面要加个at

at what time will he 为什么前面要加个at at what time did Alice arrive yesterday?为什么At在最前面 不是应该写成arri What time will feel at home? what will you do at this time? what will happen at that time?对么 what-he-(do)at this time yesterday What time is it on?-It’s on at 9:00.为什么at前面一定要用on I am not sure what time he will填：get to arrive at arrive rea --I'll will never know what he was thinking at the time. at what time at that time呢 what may be done at any time will be done at no time what may be done at any time will be done at no time.