sat语法题Traffic was heavy,so by the time B finally arrived at

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sat语法题
Traffic was heavy,so by the time B finally arrived at the theater,we 【waited】 for her for an hour,missing the entire first act of the play.
请问：为什么括号里的要改成had been waiting?因为by the time吗?是不是只要看到by the time都用过去完成时呢?

这是一道典型的【时态搭配题】.
你说的很对!该题的关键确实与 by the time 有关.
by the time 引导时间状语从句的基本用法：
①从句用一般现在时,主句用一般将来或将来完成时.例如：
By the time he arrives,I will have finished my painting.
By the time she is six,Helen will begin to learn chinese.
② 从句用一般过去时,主句用过去完成时.例如：
By the time he was 14,Mozart had composed many pieces for the harpsichord,piano and violin sa well as for orchestras
所给句子中,by the time B finally 【arrived at 一般过去时】 the theater,因此,后面用过去完成时.但是,又由于语义表达上强调【wait】这个动作一直在进行,因此,改用过去完成进行时,即 had been waiting.

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