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To his credit,Tom never told the enemy exactly what had happ

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To his credit,Tom never told the enemy exactly what had happened.
"happened"前面可以加had吗?不是一般都直接写成what happened.
To his credit,Tom never told the enemy exactly what had happ
had happened是过去完成时,指过去的过去发生的动作.
Tom never told the enemy exactly what had happened.
told说明是过去式,而不告诉敌人发生过什么就是“过去的过去”,要用had happened
what happened一般用于问句.