___________ certain that his invertion will lead to the development of production.
A.That’sB.This isC.It’sD.What’s在线课程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。
考点:it作形式主语
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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