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    精英家教网 > 高中英语 > 题目详情
    _____ is known to everybody that the moon travels round the earth.
    A．ItB．AsC．WhenD．Where
    A

    试题分析：考察it作为形式主语。本句中的It是形式主语，真正的主语是后面的that the moon travels round the earth。这里的that只是一个引导词而已，不在句中充当任何成分。句意：众所周知的事情是月球绕着地球转。故A正确。
    点评：形式主语，顾名思义，即形式上是主语，但实际上不是真正的主语，真正的主语是后面的动词不定式、动名词或主语从句等。如果让后面的动词不定式、动名词或主语从句用作主语，那么在句式上容易造成“头重脚轻”，句式不平衡，故往往用it作形式主语，而把真正的主语放在后面。it在这里没有任何意义。
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