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    Although medical science __________ control over several diseases,what worries us is that some of them are returning.

    A．achievedB．has achievedC．will achieveD．had achieved

    B

    解析试题分析：句意：虽然医疗科学已经控制了几种疾病，我们担心的是有些还会回来。从what worries us is that some of them are returning.可知现在强调的是现在的结果，所以用现在完成时，选B.
    考点：考查时态

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