1.同位语从句中,that一般不和前面句子隔开,而是直接放在所修饰的名词后面 （参考同位语从句定义：在复合句中用作同位语的从句叫同位语从句.它一般跟在某些名词后面,用以说明该名词表示的具体内容.如：
I heard the news that our team had won．我听到了我们队获胜的消息.
I had no idea that you were here．我不知道你在这里.
另：可以跟同位语从句的名词通常有new,idea,fact,promise,question,doubt,thought,hope,message,suggestion,word（消息）,possibility等.I’ve come from Mr wang with a message that he won’t be able to see you this afternoon． 我从王先生那里来,他让我告诉你他今天下午不能来看你了.）
2.这句话中,it是形式主语,that从句是真正主语,而不是充当同位语从句.