Question

初三英语，很简单！

I hear Sam has gone to Qingdao for his hoilday.
Oh,how nice ! Do you know when he _________?(left)
为什么不是 has left had left was leaving?

Answer 1

题目前半部分说I hear Sam has gone to Qingdao for his hoilday.
has gone to Qingdao 说明他已经去了青岛。然后提问是说“他什么时候离开的？”只是一般疑问句，他已经离开了，是属于过去式。所以用left

Answer 2

went

Answer 3

left
就填过去式

祝楼主进步！
要是答案还满意的话，记得采纳哦，O(∩_∩)O谢谢~！

Answer 4

left