He never went out without bodyguards, whose job it was to kill anyone who displeased him.为什么不是whose job was to...,请解释it.
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whose job引出一个定语从句， it 作从句的形式主语， to kill....不定式短语作从句的真正的主语。用it 作形式主语， 以免头重脚轻。 此句等于： He never went out without bodyguards,and it was their job to kill anyone who displeased him.这是个并列句。你说出的句子是个含非限制性定语从句的复合句。 当然也可以写成你上面说的句子--- ...,whose job was to kill.... 这时to kill...不定式短语作定语从句的表语了。 三句话表达方式不同， 但意思是一样的。 不知道你清楚了没有？