There is no known for this disease but it can be .
A. cure, treated
B. cured; treat
C. cure; treat
D. treat; cured
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(答案→)A. cure, treated
B. cured; treat
C. cure; treat
D. treat; cured
解析：考查同义词辨析。句意：这种病不知道能治愈，但可以治疗。故第一个空为治愈，由no推出需要名词，第二个空为被治疗，用被动语态，所以A项符合。