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He is not easy-going, but his trust in his friends will last forever once _______.

A.to be gained B.is gained C.being gained D.it is gained

D

解析试题分析:句意:他不是随和的人,但是他对朋友的信任,一旦被获得就永远不会失去的。Once引导的是条件状语从句,trust和gain是被动关系,而且条件状语从句用一般现在时代替一般将来时,所以选D。
考点:考查时态语态

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