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An Easy Enlish question .

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An Easy Enlish question .
I don't remember why she left the boy by himself .
而为什么不能说
I don't remember why she had left the boy by himself .
PLEASE PLEASE PLEASE!
An Easy Enlish question .
过去发生的事所以要用过去时态,因为这个动作不是一个状态,所以不能用过去完成时,至少用起来怪怪的,不妥