Tom was disappointed that most of the guests ______ when he ______ at the party.
A、had left, arrived
B、left, had arrived
C、had left, had arrived
D、left, arrived
【正确答案】：A
【题目解析】：根据前半句的was可知句子所用的时态为一般过去时，所以when引导的时间状语从句的时态应为一般过去时，即arrived；再根据句意在他到达的时候客人已经离开了，说明客人在他到达之前就已经离开了，所以客人离开要用过去完成时，即had left。
