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

    试题分析：考查时态：句意：虽然医学科学已经控制了几个危险的疾病，让我们担心的是一些又回来了。从第二句话用的进行时，可知前面是已经控制了，用现在完成时。选B。
    点评：时态的考查结合上下文找到动作发生的时间就好做了。如果没有具体的时间，就考虑句子提供的语境，利用一切可以利用的信息。
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