Henry said that either his father or his uncle ___ to attend the class meeting.A. are goingB. was goingC. were going

步骤 1：分析句子结构
句子的主句是 "Henry said"，从句是 "either his father or his uncle ___ to attend the class meeting"。从句是宾语从句，主句的谓语是过去时态，因此从句的谓语也应使用过去时态。

步骤 2：确定从句的时态
从句描述的是一个将来发生的动作，因此应使用过去将来时态，即 "was/were going to"。

步骤 3：确定主语的单复数
从句的主语是 "either his father or his uncle"，根据就近原则，谓语动词应与 "uncle" 保持一致，因此谓语动词应使用单数形式 "was"。