请教一个有关分词的问题
悬赏分：5 - 离问题结束还有 14 天 23 小时
The risks of disqualification and bodily damage seem to have little effect on some athletes. Perhaps the most famous of them all is ben Johnson. In 1988, this Canadian athlete became the fastest man in the record while doing so.
请问把while doing so改成从句，应该怎么改？
我是这样改的， 不知道对否
while he took drugs or while he did so
如果是while he was taking drugs or while he was doing so.
我就不知道如何理解了。请教各位！谢谢！
參考答案:我觉得原句的doing so 好象可以理解成：while he was taking the risk do 就是指take risk(就是用兴奋挤)你要是弄成taking drugs 好象我总觉得 不应该用taking 一样 你觉得呢？
或者while 相当于by??? 或者意思是but?