By the time the speaker entered the hall,all the listeners were seated为什么后面可以用were seated,前面不是BY+过去的时间吗?

by the time ,by then By the time by the time 用by the time造句! by the time怎么造句? by the time +现在式造句 by the time 的用法 by the time 等于什么? by the time to 谢 by the time什么意思 the time,show by the day on the time ,in the time ,at the time ,by the time on the time ,in the time ,at the time ,by the time as the time goes（went) by,with the time going byas the time goes by,with the time going by,as the time went by,用于什么时态? by the time of和by the end of in time ,on time ,by the time 的区别, as the time goes by,with the time going by,as the time went by,用于什么时态? 用By the time造句100个