He is rather difficult to make friends with, but his friendship, ________ is more true than anyone else’s.A.Once gainingB.Once gainedC.Once is gainingD.Once he gained
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B解析试题分析：这题考察条件状语从句，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，选B。
考点：考查条件状语从句的省略
点评：考查条件状语从句的省略，主要要看清主语是否一致，再考虑主动和被动关系。