【题目】I have been told to donate blood by the health expert __________ I need some in the medical treatment one day.
A. even though B. as if
C. in case D. now that
在线课程【答案】C
【解析】
试题分析：A尽管，虽然；B仿佛，好像；C以防，万一；D既然，由于。根据句意“我已被医疗专家告知献血，以防有一天我在医疗中使用”可知in case 符合语境，故选C。