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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
B

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。
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。
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