2007.10.17 : He said he was busy, which was true.
他说他很忙，这是真的。
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在这个句子中，关系代词which代表整个主句的意思；在从句中，又充当主语的成分。
例句：
Watt watched a steaming kettle for quite a while, which rather annoyed his aunt.
瓦特看那个冒气的水壶看了好长一段时间，这使他的姑妈非常恼火。
The Foreign Office is still holding up my passport, which worries me much.
外交部仍然压着我护照，这让我很担心。
海纳百川，有容乃大；壁立千仞，无欲则刚。