She has longer hair than -------..(他/她/我）

上面都错了.than前后的比较对象应该是一致的.前面是"She",所以后面应该用人称代词,而不是物主代词.正确答案是：
She has longer hair than he / she / I.(他/她/我） --- 正式的表达.[than是连词,不是介词,后面可接人称代词主格.]
或：She has longer hair than him / her / me.(他/她/我） ---- 非正式表达,常用于口语中.
试比较：
Her hair is longer than his / hers / mine. [her 与“his / hers / mine”对应.]
问题补充：She has longer hair than Tom.[she与Tom对应.]
比较：Her hair is longer than Tom's. [her与Tom's对应]