the lady treats the boy next door well as if he （）her own son.填is 还是were?

the lady treats the boy next door well as if he （）her own son.
填is 还是were?

必须是is

waswere为什么虚拟语气是个假设 不可能发生然后呢？虚拟语气 用weretreats不是一般现在时么前后不是要一致么treat是说的是事实
后面说像她儿子 是假设这是明白所以是虚拟语气那was 和were选啥？为什么用were啊？虚拟语气就一定用were？不一定 这里用was...

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