第 1 题 · 六级
The displacement of workers by machines worried the union, which the factory has tried hard to reduce.
核心词：displacement dɪsˈpleɪsmənt n. 取代；移置
机器取代工人让工会担忧，工厂已努力减少这一情况。
现在完成时主谓宾 + 介词短语 + which 从句（现在完成 + try to）短语 the displacement of短语 water displacement
The ___ of workers by machines worried the union, which the factory has tried hard to reduce.
第 2 题 · 六级
It is unrealistic to expect quick results, which the patient teacher has told us many times.
核心词：unrealistic ˌʌnriəˈlɪstɪk adj. 不现实的
期望快速见效是不现实的，耐心的老师已多次告诉我们。
现在完成时形式主语 + 不定式 + which 从句（现在完成 + 频度）短语 an unrealistic expectation短语 be unrealistic about
It is ___ to expect quick results, which the patient teacher has told us many times.
第 3 题 · 六级
The purity of the water is tested daily, which the factory has promised to ensure.
核心词：purity ˈpjʊərəti n. 纯净，纯度
水质每天都要检测，工厂已承诺确保这一点。
现在完成时主系表 + 被动 + 频度 + which 从句（现在完成 + promise to）短语 high purity短语 water purity
The ___ of the water is tested daily, which the factory has promised to ensure.
