题目内容

Although medical science________control over several dangerous diseases，what worries us is that some of them are recurrent.
A．achievedB．has achieved
C．will achieveD．had achieved
B
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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