第 1 题 · 四级
One of the engines had a malfunction, which the pilot reported at once.
核心词：malfunction ˌmælˈfʌŋkʃn n. 故障，失灵
其中一个引擎发生故障，飞行员立刻报告。
一般过去时主谓宾 + which 从句短语 a malfunction短语 mechanical malfunction
One of the engines had a ___, which the pilot reported at once.
第 2 题 · 四级
The shop must restock the shelves, which the customers have been waiting for.
核心词：restock ˌriːˈstɒk v. 补充货源，再储存
商店必须补充货架，顾客们一直在等待。
一般现在时情态 + 主谓宾 + which 从句（现在完成进行）短语 restock the shelves短语 restock supplies
The shop must ___ the shelves, which the customers have been waiting for.
第 3 题 · 四级
The damage caused by the storm was immeasurable, which shocked the whole town.
核心词：immeasurable ɪˈmeʒərəbl adj. 无法估量的
暴风雨造成的损失无法估量，整个小镇都震惊了。
一般过去时过去分词作后置定语 + 主系表 + which 从句短语 immeasurable damage短语 immeasurable value
The damage caused by the storm was ___, which shocked the whole town.
