He---the chair before his brother returned为什么这里填had mended 不用has mended?

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He---the chair before his brother returned为什么这里填had mended 不用has mended?
He---the chair before his brother returned
为什么这里填had mended 不用has mended?

He---the chair before his brother returned为什么这里填had mended 不用has mended?
his brother returned
已经是过去式了
他在过去的一个时间点之前完成的
属于过去完成时~
所以用had
而不是has

his brother returned是个时间点,已经用了过去时,那么在那之前发生的事情就要用过去的过去,也就是过去完成时了