问题描述：
They were both of middle height和they are both of middle height的区别
they were both of middle height
they are both of middle height
意思好像是一样的,哪么什么时候用were什么时候用are呢?
they were both of middle height
they are both of middle height
意思好像是一样的,哪么什么时候用were什么时候用are呢?
问题解答：
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