第 1 题 · 高考
The goods are sent by rail, which is cheaper than by air.
核心词：rail reɪl n. 铁路
货物通过铁路运送，比空运便宜。
被动语态 + than 比较短语 by rail短语 rail transport
The goods are sent by ___, which is cheaper than by air.
第 2 题 · 高考
The delay exasperated the passengers, who waited for hours.
核心词：exasperate ɪɡˈzæspəreɪt vt. 激怒
延误让乘客恼火，他们已经等了几个小时。
一般过去时who 非限制性定语从句短语 be exasperated by短语 exasperate sb
The delay ___ the passengers, who waited for hours.
第 3 题 · 高考
She hung the underpants out to dry, which took only an hour.
核心词：underpants ˈʌndəpænts n. 内裤
她把内衣裤挂出去晾晒，只花了一小时。
一般过去时hang out to dry + which 定语从句短语 underpants短语 a pair of underpants
She hung the ___ out to dry, which took only an hour.
