--This kind of sports is exciting． --Yes，but it's dangerous．One can't do it ____ he or she has got s...
2023-01-06 20:51:45 72次 2014-2015学年山东滕州木石中学九年级下学业水平模拟1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：
--This kind of sports is exciting．
--Yes，but it's dangerous．One can't do it ____ he or she has got some training．
A．if B．after C．when D．Unless
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