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_______ was known to them that the boss had broken his promise______ he would give them a rise.
A.What; whatB.It; whichC.It; thatD.As; that
C

试题分析:这里that引导的主语从句是句子的真正主语,所以需要It作形式主语;在主语从句中,又包含一个同位语从句,引导词在同位语从句中不作任何成分,且无实际意义,故用that引导。
点评:在英语中,it有许多不同的用法,它既可以用作代词(如人称代词、非人称代词),也可以用作引导词(作形式主语或形式宾语),还可以用来构成强调句型。it作非人称代词表示天气、日期、时间、温度、距离、价值、路程、度量、自然现象与环境等。也可模糊地指一般情形或上文的部分或整个意思;这道题目的关键在于判断从句是定语从句还是同位语从句。引导词that引导定语从句时,在从句中作主语或宾语,作宾语时常常省略;that在同位语从句中仅起连接作用,不充当任何成分,并且不能省略。
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