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Although medical science________control ...

Although medical science________control over several dangerous diseases,what worries us is that some of them are recurrent.

A.achieved  B.has achieved

C.will achieve  D.had achieved

 

B 【解析】答案 B [句意:尽管医学已经成功地控制了一些危险的疾病,但令我们担心的是,其中有些疾病还会反复发作。根据句意可知说话者谈论的是从过去延续到现在的情况,故用现在完成时态。]  
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