问题描述：
His teacher told him that since his parents were working abroad ,either
27.His teacher told him that since his parents were working abroad ,either his grandparents or one of his uncles ______ allowed to come to the parents’ meeting .
A.was B.were C.are D.is
选什么?为什么?
27.His teacher told him that since his parents were working abroad ,either his grandparents or one of his uncles ______ allowed to come to the parents’ meeting .
A.was B.were C.are D.is
选什么?为什么?
问题解答：
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