第 1 题 · 六级
The vase is made of fine porcelain, which the grandmother has kept for fifty years.
核心词：porcelain ˈpɔːsəlɪn n. 瓷，瓷器
这个花瓶是上等瓷器做的，祖母已经保存了五十年。
现在完成时被动语态 + 介词短语 + which 从句（现在完成）短语 a porcelain vase短语 fine porcelain
The vase is made of fine ___, which the grandmother has kept for fifty years.
第 2 题 · 六级
The committee will convene next Monday, which the members have been informed about by email.
核心词：convene kənˈviːn v. 召集，开会
委员会将于下周一开会，成员们已通过邮件收到通知。
现在完成时一般将来时 + 时间状语 + which 从句（现在完成被动）短语 convene a meeting短语 convene next week
The committee will ___ next Monday, which the members have been informed about by email.
第 3 题 · 六级
We must conserve the natural resources, which the coming generations will depend on.
核心词：conserve kənˈsɜːv v. 保护，保存
我们必须保护自然资源，子孙后代将依赖它们。
一般将来时情态动词 + 主谓宾 + which 从句（一般将来时 + depend on）短语 conserve energy短语 conserve water
We must ___ the natural resources, which the coming generations will depend on.
