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.
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what happened to 和what happened
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what happen和what happened有什么区别
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