No one can walk the wire in the air without a bit of fear unless very young. A．h
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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 |
试题答案
B
解析这题考查条件状语从句的省略，英语中，如果主从句的主语一致，可以省略从句中的主语和be动词，像这题，完整的表达应该是：unless he is trained young，省略he is后就剩下trained，选B。