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By the time the speaker entered the hall,all the listeners w

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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 the speaker entered the hall,all the listeners w
这里的by the time相当于at the moment when,在.时候.
by the time常用作“在.之前”,那就要与完成时连用,如:
by the time you came into the room,we had already decided what to do.