语法填空They took special coures when they studied atcollege.为什么用took,而不用had taken(在那以前)

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语法填空
They took special coures when they studied atcollege.
为什么用took,而不用had taken(在那以前)

They took special coures when they studied at college.
他们在大学学习的时候上了研究课.
When在这里作为（从属）连词,引导时间状语从句,表示“当……时候”或“在……的时候”.
表示过去发生的事,如果主从句的动作有先后之分,主句才要相应变化：
1)主句的动作在从句之前,那么主句就用过去完成时；
2)主句和从句的动作时同时发生或仅表示那个期间都在做的事,那就都用过去式.
这里面的“在大学学习”和“上选修课”其实是并列的处在共同期间的动作,所以不用had taken.

因为是when不是before所以不是在那以前
，是在那时

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