His teacher told him that since his parents were working abroad , either his grandparents or one of his uncles ______ allowed to e to the parents’ meeting .
A.was
B.were
C.are
D.is
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A解析本题考查时态和主谓一致。由told判定用过去时；either…or…连接两个词作主语；谓语动词与or后的保持一致。此处与one of his uncles一致，用单数。