求2011年陕西高考短文改错的详细解析,最好是把为什么要这么改的原因说出来,谢谢了T-T

LastSundaymorning,whenIwashavingawalkintheparknearmyhome,Icameacrossacrewmakeanewfilmwithoneofmyfavouriteactor.Ididn'thavemycamerawithmeatthattime,butIrushedbackhometoget.Unfortunately,bythetimeIgotback,theyhavefinishedthesceneandactorcouldn'tbeseeneverywhere.Iwasreallydisappointingandabouttoleavewhenhewalkedoutabuilding.Hewasrightthereinthefrontofme!I

couldn'tbelievemyluck-notonlydidIhadmyphototakenwithhim,buthesignedhisnameonmyshirt!

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