◎ 题干
We must try _____ English well because it's very useful.     
[     ]
A. learn  
B. learned    
C. learning    
D. to learn
◎ 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“We must try _____ English well because it's very useful.[ ]A. learnB. learned C. learningD. to learn …”主要考查了你对  【不定式】  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。