◎ 题干
It is rather difficult to make friends with him, but his friendship, _________ is more true than any other's.  
[     ]
A. once gained    
B. When to gain    
C. After gaining  
D. While gaining
◎ 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 is rather difficult to make friends with him, but his friendship, _________ is more true than any other's. [ ]A. once gainedB. When to gainC. After gaini…”主要考查了你对  【从属连词】  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。