It is being repaired by a friend of my father's中的is being是表示正在进行中的中吗?那为什么正在进行中又用过去式repaired呢?

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• It is being repaired by a friend of my father's中的is being是表示正在进行中的中吗?那为什么正在进行中又用过去式repaired呢?
• 在选择题中,同时有a friend of my father 和 a friend of my father's 选什么?比如：----Do you know the man who is playing tennis there?----Certainly.He is a friend of _______.A.my father'sB.my father我觉得A和B，都说得通，但答案为A求解释
• the title of the novel a friend of my father‘s 为什么后面的那个要加’s 而前面的那个则不用