问题
选择题
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
答案
答案：B
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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
答案：B