having been trained 既表进行又表完成,这里不需要进行时,没有强调过程,如果要选A 需要在后面加上一个since,表达自从很小就受过训练.
C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
故选B是对的,完整句子应该是unless（ he or she） （is） trained（ when） very yong.
考查的就是unless引导的条件从句省略了he is
No one can walk the wire without a bit of fear unless ____ve
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