what happened和what has（had、have）happened用法上有何不同?

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• 一片英语阅读理解      An old man died and left his son a lot of money.But the son was a foolish young man,and he quickly spent all the money,so that soon he had nothing left.Of course,when that happened,all his friends left him.When he was quite poor and alone,he went to see Nasreddin,who was a kind,clever old man and often helped people when they had troubles.     My money has finished and my friends have gone,said the young man.What will happen to me now?  
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• what happened和what has（had、have）happened用法上有何不同?它们都表示问句或者宾语从句“发生了什么”吧.但用法上有区别吗?学了现在完成时以后习题的答案都用后者了,实在搞不懂.
• 英语翻译An old man died and left his son a lot of money.But the son was a foolish young man,and he quickly spent all the money,so that soon he had nothing left.Of course,when that happened,all his friends left him.When he was quite poor and alone,he went to see Nasreddin,who was a kind,clever old man and often helped people when they had troubles.'My money has finished and my friends have gone,' said the young man.'What will happen to me now?' 'Don't worr
• what had happened和 what has happened有什么区别翻译和用法上有什么区别“he told me what______ ” 中填这两个回答有什么不同的效果
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