第 1 题 · 高考
The reason for the mistake is still unclear, so we need to investigate further.
核心词：unclear ˌʌnˈklɪə adj. 不清楚的
出错的原因仍不清楚，所以我们需要进一步调查。
一般现在时并列句短语 be unclear about短语 an unclear reason
The reason for the mistake is still ___, so we need to investigate further.
第 2 题 · 高考
She attained her goal through hard work, which encouraged many young people.
核心词：attain əˈteɪn vt. 达到，获得
她通过努力实现了目标，这鼓励了许多年轻人。
一般过去时which 非限制性定语从句短语 attain a goal短语 attain success
She ___ her goal through hard work, which encouraged many young people.
第 3 题 · 高考
His nose bled after the fall, so his mother took him to the doctor.
核心词：bleed bliːd vi. 流血
摔倒后他的鼻子流血了，所以妈妈带他去看医生。
一般过去时并列句短语 bleed heavily短语 stop the bleeding
His nose ___ after the fall, so his mother took him to the doctor.
