◎ 题干
It is rather difficult to make friends with her, but her friendship, ____ , is truer than any other's.  
[     ]
A. while gaining              
B. after gaining      
C. when to gain                
D. once gained
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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 her, but her friendship, ____ , is truer than any other's.[ ]A. while gainingB. after gainingC. when to gainD. …”主要考查了你对  【从属连词】【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。