第 1 题 · 六级
The gold is kept in a stone vault, which the careful bank has guarded day and night.
核心词：vault vɔːlt n. 拱顶；金库；地下室
黄金存放在石砌的拱顶金库里，细心的银行日夜看守。
现在完成时被动语态 + 介词短语 + which 从句（现在完成 + 时间状语）短语 a bank vault短语 a stone vault
The gold is kept in a stone ___, which the careful bank has guarded day and night.
第 2 题 · 六级
The manager worked hard to rectify the mistake, which the grateful customers have thanked him for.
核心词：rectify ˈrektɪfaɪ v. 纠正，改正
经理努力纠正错误，感激的顾客为此感谢他。
现在完成时主谓 + 副词 + 目的不定式 + 主谓宾 + which 从句（现在完成 + thank for）短语 rectify a mistake短语 rectify the situation
The manager worked hard to ___ the mistake, which the grateful customers have thanked him for.
第 3 题 · 六级
The chef added spice to the soup, which the happy family has enjoyed at dinner.
核心词：spice spaɪs n. 香料，调味品
厨师在汤里加了香料，开心的家人在晚餐时享用。
现在完成时主谓宾 + 介词短语 + which 从句（现在完成 + at dinner）短语 add spice to短语 a pinch of spice
The chef added ___ to the soup, which the happy family has enjoyed at dinner.
