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    精英家教网 > 高中英语 > 题目详情
    ___________ certain that his invertion will lead to the development of production.
    A．That’sB．This isC．It’sD．What’s
    C

    试题分析：通过分析句子结构，可知这个句子中包含一个主语从句，且主语从句位于句末，只能用it作形式主语，故选C。
    点评：作为形式主语的it并无实际语义，只是为满足语法上的需要，避免句子头重脚轻，它代替的是句子的真正主语。it 作形式主语，主要分为下列三种情况：不定式作主语、动名词作主语和名词从句作主语。
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