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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 trainedD.being trained
B

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。
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