题目内容

He is rather difficult to make friends with, but the friendship of his, _____, is truer than that of anybody else’s.  

A.while gained B.when to gain C.after gaining D.once gained

D

解析试题分析:句意:和他交朋友相当困难,但是他的友谊,一旦获得了,就比其他任何人的都真实.当主从句的主语一致时,可以省略从句的主语和be动词,once gained=once" his friendship is "gained,选D。
考点:考查状语从句的省略

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