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)
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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)
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)

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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