◎ 题干
Everyone knows _____ is dangerous to play with fire, but _____ is difficult is to prevent children from
playing with fire.  
[     ]
A. that; it      
B. it; it      
C. that; what      
D. it; what
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Everyone knows _____ is dangerous to play with fire, but _____ is difficult is to prevent children from playing with fire. [ ]A. that; it B. it; it C. that…”主要考查了你对  【连接代词】【主语从句】【it的用法】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。