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

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theTVplaybeganatseveno''lock(现在完成时)theTVplaybeganatseveno''lock(现在完成时)theTVplaybeganatseveno''lock(现在完成

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

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。