题目内容
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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