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问题: 请分析一个句子

--How long did the meeting last this afternoon?
--It was supper time ______the meeting was over.
A. that B. at which C. when D. until
It was supper time when the meeting was over.
这个句子到底是状语从句/定语从句/主语从句? 
我怎么觉得怎么分析都有道理? 

解答:

没错,这题应该选C.when
It was supper time when the meeting was over.
这个句子是主语从句。其中it是它的形式主语。

如果说是时间状语从句的话,一般与supper time不会同时出现两个表同一时间的结构来作状语,故它不是状语从句。
如果说是定语从句呢,则在逻辑上来说是不合适的,因为这样的话本句就得理解为:那是会议结束时的晚餐时间。