what happened!my friend how can i help you

Fri, Can you i______ what happened in my dream last night? My little brother ___(想知道)What happened then My heart goes on no matter what will be happened. what happened!my friend how can i help you what has happened?I have said something unking to my friend.这句为什麽不用 what have happened What had happened?What had happened?What had happened? 是What happened 还是what’s happened what happened=what's happened吗? what happened to 和what happened What-------? I --------my key and can't open the door.A.happened;lostB.has happened;lostC.happens;have lostD.has happened;have lost选哪个?为什么? what happened at last? what happened on What Happened to Us what happened then Dear,what happened to what happened to she what happened to him?