over the years the cave wall had been shaped by 为什么用过去完成时

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over the years the cave wall had been shaped by 为什么用过去完成时
over the years the cave wall had been shaped by 为什么用过去完成时

over the years the cave wall had been shaped by 为什么用过去完成时
over the years 本应于现在完成时连用但是这句话肯定是叙述过去的情况 短文中肯定用了过去式态,到那时已经形成所以只能用过去完成时 如果用现在完成时就只能说到现在为止刚刚形成或定型