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?

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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?
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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?
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?

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.

B
除非从小受过训练,没有人能毫不畏惧的走过细线
从句里用到的事态可以说明实情就可以了 能简则简

回答中:
No one can walk the wire without a bit of fear unless _______ very young. 悬赏分:5 | 离问题结束还有 14 天 23 小时 | 提问者:推倒度受受 | 检举
A. having been trained B. trained C. to be trained D. ...

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回答中:
No one can walk the wire without a bit of fear unless _______ very young. 悬赏分:5 | 离问题结束还有 14 天 23 小时 | 提问者:推倒度受受 | 检举
A. having been trained B. trained C. to be trained D. being trained
答:最佳答案B。 =unless he is trained very young
除非很小的时候受过训练,否则没有人能走钢丝而一点都不害怕的。

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我也选A
1.过去完成了的。
2.被动语态
C 我有点不确定。