No one can walk the wire in the air without a bit of fear unless ___ very young. A.having trained B....
2022-11-09 20:43:06 203次 2014-2015学年四川省高三一诊模拟英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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