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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

 

【答案】

B

【解析】

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。

考点:考查时态

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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