2. 公务员
  3. Although medical science ________to control over many dangerous diseases，what worries us is that some of them are returning．

Although medical science ________to control over many dangerous diseases，what worries us is that some of them are returning．

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问题 Although medical science ________to control over many dangerous diseases，what worries us is that some of them are returning．
选项 A、achieved
B、has achieved
C、will achieve
D、had achieved
答案B
解析 依据what worries us is that some ofthem are returning可判断前面是表示到目前为止已经发生的事情，所以用现在完成时，故正确答案为B。译文：虽然现在医药科学已经能够控制多种危险疾病，但是我们担心的是其中的一些正在卷土重来。
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