It will be many years the doctors and medical scientists can find for cancer.
A. since; cures
B. when; treatments
C. before; cures
D. until; treaments
网友回答
A. since; cures
B. when; treatments
(答案→)C. before; cures
D. until; treaments
解析:第一空考查连词,since 自从,when 当什么的时候,before 在什么之前,才,就,until直到,第二空考查短语:cures for cancer癌症的治疗方法,句意:许多年医生们和医疗科学家才找到了癌症的治疗方法。所以选C。