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    精英家教网 > 高中英语 > 题目详情
    Although medical science ______ control over several dangerous diseases, what worries us is that some of them are returning.
    A．achievedB．has achievedC．will achieveD．had achieved
    B
    考查动词时态。由are returning(将会返回)可知“现在已经成功控制”了，要用现在完成时。
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