what happend while Linda was on the telephone 中while是否可以写成when 为什么这里用while而不用when

what happend? what happend what happend while Linda was on the telephone while不是不可以用在句中吗 what happend while Linda was on the telephone 中was on the phone讲解一下好吗 what happend是什么意思 what happend while Linda was on the telephone 中while是否可以写成when 为什么这里用while而不用when what‘s happend 还是 what’s the happend那一个正确? what happend 和what had happend 怎么用 What is happend over there? BUT,BUT WHAT HAPPEND是什么意思 what happend with you对么 while和when谁用在句首谁用在句中 what happend （） Linda was on the telephone填什么,为什么呢, Do you know what happend to him? He was heard_______just now.What happend? What happend 的原句是什么? what happend sister什麼意思? what happend这么说对吗还是说 what was happend happend是动词过去 为什么这么用 Do you know what happend to him?为什么用what happend to him?