The TV program has begun since half an hour ago(同义句)The TV program_____ _____ _____ _____half an hour最后一个空是for吧?那前三个是什么?这是我们学校发的预习题,所以麻烦讲解清楚一点~

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The TV program has begun since half an hour ago(同义句)
The TV program_____ _____ _____ _____half an hour
最后一个空是for吧?那前三个是什么?这是我们学校发的预习题,所以麻烦讲解清楚一点~

has been on for