2014
高考英语单项选择精英系列训练题(16)及答案单项选择 21.(•
山东聊城第一学期期末)we cannot understand a disease ________ we understand the person who has the disease. a. unless b. even though c. on condition that d. while [解析]本题考查条件状语从句的引导词。句意:除非我们了解患这种疾病的人,要不然我们就不能了解这种疾病。unless“除非,如果不”,引导条件状