Although medical science ______ control over several dangerous diseases, what wo
题型：不详难度：来源：
Although medical science ______ control over several dangerous diseases, what worries us is that some of them are returning.| A．achieved | B．has achieved | C．will achieve | D．had achieved |
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答案
| B |
解析
| 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。 |
举一反三
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