Question

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

Answer 1

B

解析試題分析：這題考察條件狀語從句，當主從句的主語一致時，可以省略從句的主語和be動詞，once gained="once" his friendship is gained，選B。
考點：考查條件狀語從句的省略
點評：考查條件狀語從句的省略，主要要看清主語是否一致，再考慮主動和被動關系。