组卷网 > 高中英语综合库 > 语法 > 词法 > 代词 > it的特殊用法 > it 作形式主语
题型:单项选择 难度:0.65 引用次数:107 题号:22424187
______ is known to all that the gun powder was first invented by the Chinese.
A.AsB.WhichC.ItD.What

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