the TV play began at seven o'lock(现在完成时)

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the TV play began at seven o'lock(现在完成时)

The TV play has been on since seven o'lock.

The TV play HAVE begun at seven o'lock.

the tv play has begun since 7:00

the TV play has begun since seven o'lock
主语是单数 用has
at是具体时刻,所以换成表示完成时的since

the TV play has begun at seven o'lock。