◎ 题干
It's good ___ you to keep____ when you have something difficult_____.  
[     ]
A. for; trying; to do              
B. of; trying; doing     
C. for; to try; to do              
D. of; trying; to be done
◎ 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“It's good ______ you to keep ______ when you have something difficult ______. [ ]A. for; trying; to do B. of; trying; doing C. for; to try; to do D. …”主要考查了你对  【不定式】【动名词】【介词】  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。