◎ 题干
All these questions fill my head, making _____ for me to sleep well at night.
[     ]
A. it is difficult
B. it difficult
C. difficult
D. it difficulty
◎ 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“All these questions fill my head, making _____ for me to sleep well at night. [ ]A. it is difficult B. it difficult C. difficult D. it difficulty …”主要考查了你对  【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。