what happened to 是一个一般过去时的问句,后跟的时间状语是类似yesterday等一般过去时的时间状语；而what had happened to是过去完成时,后跟的时间状语是类似before you got to the station等这样的时间状语,就是以这个过去的时间点作为参照点,那么这个参照点之前的动作用过去完成时.
what happened to 和 what had happened to的区别是什么?
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