◎ 题干

- Why don’t you still understand this problem?
- The teacher didn’t have it _______ clearly.

[     ]
A. explaining    
B. to explain        
C. explain          
D. explained
◎ 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“- Why don’t you still understand this problem?- The teacher didn’t have it _______ clearly. [ ]A. explaining B. to explain C. explain D. explained…”主要考查了你对  【过去分词】  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。