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We still don't know the exact time for t...

We still don't know the exact time for the first human being ________.

A.to have been cloned                    B.being cloned

C.having been cloned                     D.to be cloned

 

D 【解析】 试题分析:考查非谓语动词。句意:我们仍然不知道第一个将被克隆的人的确切时间。在这里动词不定式被动式作后置定语,表示将来的意思。故选D。 【知识归纳】 the first/last to do sth.第一个或最后一个做……的人。在这里动词不定式作后置定语。He is the first student to reach the school.他是第一个到学校的人。 考点:考查非谓语动词  
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