第 1 题 · 四级
The car had a breakdown on the highway, which kept the driver waiting for help.
核心词：breakdown ˈbreɪkdaun n. 故障，崩溃
汽车在高速公路上抛锚，司机等着救援。
一般过去时have a breakdown + which 从句 + keep sb doing短语 have a breakdown短语 a nervous breakdown
The car had a ___ on the highway, which kept the driver waiting for help.
第 2 题 · 四级
The custom originated in the south, which historians have studied for years.
核心词：originate əˈrɪdʒɪneɪt v. 起源，开始
这种风俗起源于南方，历史学家研究多年。
现在完成时originate in + which 从句（现在完成）短语 originate in短语 originate from
The custom ___ in the south, which historians have studied for years.
第 3 题 · 四级
The map shows the geographic features of the area, which the students must learn.
核心词：geographic ˌdʒɪəˈgræfɪk adj. 地理的
地图展示了该地区的地理特征，学生们必须学习。
一般现在时主谓宾 + which 从句 + must do短语 geographic features短语 a geographic region
The map shows the ___ features of the area, which the students must learn.
