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No one can walk the wire in the air with...

No one can walk the wire in the air without a bit of fear unless ___ very young.

A.having trained       B. trained

C. to be trained        D. being trained

 

B. 【解析】 试题分析:句意:没有人能在没有一点恐惧的情况下走空中钢丝,除非他是在很小的时侯接受过训练。A . having trained 既表主动又表完成,这里不需要主动进行,没有强调过程, C .将来被动,意思完全不对。D . 表达一直在被训练,和后边的very young不符合。 trained过去分词,表示被动,完整句子应该是unless( he or she) (is) trained( when) very young. 考查的就是unless引导的条件从句省略了he is,故选B.。 考点:考查非谓语动词和省略的用法。  
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