No one can walk the wire without a bit of fear unless ______

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No one can walk the wire without a bit of fear unless _______ very young.
A.having been trained B.trained C.to be trained D.being trained
我想选A,A对吗,为什么?

应该选B,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 YONG不符合,也不合适.
B,完整句子应该是unless（ he or she）（was） trained（ when） very yong.将括号中省略了就是问题的原型.

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