The Reads________lunch when I got to their house．A.were havingB.was havingC.are havingD.is having
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A解析分析：the Reads是指Read一家人的意思，属于复数概念。have lunch(吃中饭)是个可以延续的动词，和when I got to their house时间状语从句中的短动作got to相比较是两个过去同时但一长一短的动作，短动作用一般过去时，长的动作要用过去进行时，所以选A项were having．