Although medical science control over several dangerous diseases.what worries us is that some of them are recurrent.A．achieved B．has achievedC．will achieve D．had achieved 题目和参考答案——青夏教育精英家教网—

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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

【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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