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while的。。

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I (talk) on the photo with my classmate when my mother come back.
while的。。
解题思路: when和 while都可以表示“当……时候”,但是他们也有一定的区别。When引导的时间状语从句一般表示这个动作已经发生(动词的时态一般为一般过去时),而while引导的时间状语从句一般强调动作正在进行(动词的时态一般为进行时)。
解题过程:
I was talking (talk) on the photo with my classmate when my mother came back.
最终答案: