题目内容：

It was at 9 o'clock that he came back和It was 9 o'clock which he came back为什么分别that和which

优质解答

It was at 9 o'clock that he came back.这里It was……that……是一个强调句,只是一个句型.可以转换为He came backat 9 o'clock.It was 9 o'clock which he came back里which 是 因为 9 o'clock 引导 出一个 定语从...