◎ 题干
He is difficult to make friends with, but the friendship of his, ____, is more true than any other's.
[     ]
A. once gained
B. when to gain
C. after gained
D. while gaining
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He is difficult to make friends with, but the friendship of his, ____, is more true than any other's. [ ]A. once gainedB. when to gainC. after gained D. wh…”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。