It is about 5 o'clock ____ we have our supper.A when B that

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It is about 5 o'clock ____ we have our supper.A when B that
选A

A当我们要吃饭的时候是5点
B It is at about 5 o'clock that we have our supper是在五点钟我们吃饭
如果不加at , 5 o'clock 就相当于一个时间段用when ,加上at就是一个时间点,就用that
再问： A的话是主语从句吗？
再答：不是，是表语从句，It （主语）is （系动词）about 5 o'clock（表语） when we have our supper. 不是强调句，如果是强调句的话恢复到正常语序是we have our supper about 5 o'clock，明显句子不正确
再问： when引导的句子是时间状语从句吗？可不可以理解为主语从句呢 it做形式主语真正的主语是when从句即 when we have our supper is about 5 o'clock。
再答：恩，呵呵，也可以这么理解，但是不要这么写句子哦
再问：所以我就搞不懂when引导的是什么句子了
再答： when 的用法很多，他并不是单一的一种用法，可以引导的从句也很多，主语从句，表语从句，宾语从句啊，状语从句啊，这个要看具体语境了，有一个典型句型是，she was about to go when he came ，be about to do sth when ……正要做某事，突然……。可以查下字典具体了解下哈

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