Although medical science __________ control over several diseases,what worries u
题型：不详难度：来源：
Although medical science __________ control over several 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
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. |
举一反三
He to keep this book for a month.| A．will allow | B．will be allowed | C．allows | D．allowed |
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Our teacher told us that the earth around the sun.| A．moves | B．moved | C．to move | D．moving |
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I have got four day"s holiday to Paris. I _______ my father.| A．am taking | B．had taken | C．took | D．have taken |
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Hurry up! The train_______. You know, it________at 8: 30 am.| A．leaves; leaves | B．is leaving; leaves | | C．leaves; is leaving | D．is leaving; is leaving |
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His sister left home in 1998, and _______ever since.| A．has not heard from | B．had not heard from | | C．has not been heard of | D．had not been heard of |
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