题目内容
He is rather difficult to make friends with, but his friendship, ________, is more true than any other.
A. after gaining B. while gaining
C. once to gain D. once gained
D
【解析】
试题分析:考查条件状语从句。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。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.。故D正确。
考点:考查条件状语从句
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