第 1 题 · 高考
The tertiary sector provides services, which drives the modern economy.
核心词：tertiary ˈtɜːʃəri adj. 第三级的
第三产业提供服务，推动现代经济。
一般现在时which 非限制性定语从句短语 the tertiary sector短语 tertiary education
The ___ sector provides services, which drives the modern economy.
第 2 题 · 高考
He wore a vest under his shirt, which kept him warm.
核心词：vest vest n. 背心
他在衬衫里穿了件背心，保持温暖。
一般过去时wear + under + which 定语从句短语 a vest短语 a bulletproof vest
He wore a ___ under his shirt, which kept him warm.
第 3 题 · 高考
He decided to forego the dessert, which helped him lose weight.
核心词：forego fɔːˈɡəʊ vt. 放弃
他决定放弃甜点，这帮助他减肥。
一般过去时decide to do + which 定语从句短语 forego a chance短语 forego pleasure
He decided to ___ the dessert, which helped him lose weight.
