第 1 题 · 四级
The doctor gave the patient an injection, which relieved his pain at once.
核心词：injection ɪnˈdʒekʃn n. 注射
医生给病人打了一针，立刻减轻了他的疼痛。
一般过去时give sb sth + which 定语从句 + at once短语 give an injection短语 relieve pain
The doctor gave the patient an ___, which relieved his pain at once.
第 2 题 · 四级
It is peculiar that he never answers the phone during the day.
核心词：peculiar pɪˈkjuːlɪə adj. 奇怪的；特有的
很奇怪，他白天从不接电话。
一般现在时It is + adj + that 主语从句短语 be peculiar to短语 answer the phone
It is ___ that he never answers the phone during the day.
第 3 题 · 四级
I can say with certainty that the train will arrive on time.
核心词：certainty ˈsɜːtnti n. 必然，确定
我可以肯定地说，火车会准时到达。
一般将来时with certainty + 宾语从句 + 一般将来时短语 with certainty短语 arrive on time
I can say with ___ that the train will arrive on time.
