Question

He is rather difficult to make friends with, but his friendship, ________ is more true than anyone else’s.

1. A.
   Once gaining
2. B.
   Once gained
3. C.
   Once is gaining
4. D.
   Once he gained

Answer 1

B
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。