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I was just leaving the classroom _____ it rained.

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I was just leaving the classroom _____ it rained.
A.while B.when.
选B,
while后接非延续性动词,例如:watch TV.在时间状语从句中通常翻译为“一边……一边”,例句:I am washing the dishes while my sister is watching TV in the room
when 后接延续性动词,表示一种状态
本题的翻译是“我刚要离开教室的时候,外面下雨了”这道题也是一个固定的句式“I was doing sth ……when……”意思是“我正在做……这时……”
类似的还有“I was about to do sth ……when……”意思是“我刚想去做……这时……”“I had just done sth ……when……”意思是“我刚做完……这时……”