题目

They discovered the medical treatments_showed promise in the fight against malaria. (用适当的词填空) 答案：【答案】that或者which【解析】考查定语从句。句意：他们发现了在对抗疟疾方面显示出希望的药物。分析句子结构可知，空处引导限制性定语从句，指代先行词treatments，在从句中作主语，应该使用that或者which引导定语从句。故填that或者which。11．已知$\left\{\begin{array}{l}{x=-1}\\{y=2}\end{array}\right.$是二元一次方程组$\left\{\begin{array}{l}{3x+2y=m}\\{nx-y=1}\end{array}\right.$的解，则mn的值是-3．