问题
选择题
He is rather difficult to make friends with, but his friendship, _____ is more true than anyone else’s.
A．Once gaining
B．Once gained
C．Once is gaining
D．Once he gained
答案
答案：B
题目分析：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。
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。
