◎ 题干
He is not easy-going, but his trust in his friends will last forever once _______.
A.to be gainedB.is gained
C.being gainedD.it is gained
◎ 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“ He is not easy-going, but his trust in his friends will last forever once _______.A.to be gainedB.is gainedC.being gainedD.it is gained…”主要考查了你对  【状语从句】  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。