题目内容
【题目】Alice and Mary are sisters and (they) mother is my aunt.
【答案】their
【解析】 根据“Alice and Mary...”可知主语是复数，既they要用复数形式。所以答案是their。
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题目内容
【题目】Alice and Mary are sisters and (they) mother is my aunt.
【答案】their
【解析】 根据“Alice and Mary...”可知主语是复数，既they要用复数形式。所以答案是their。