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The children have started watchiung the film at 2 o'clock an

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The children have started watchiung the film at 2 o'clock and it hasn't finished yet.
还是The children started watchiung the film at 2 o'clock and it hasn't finished yet.哪一句对?为何?
The children have started watchiung the film at 2 o'clock an
后面那句对的,start是短暂的动词,而且后面是某个时间点不能加have,加了have就表示已经开始了,但句中的意思是2点的时候开始