滑雪马拉松已经开始5小时了～这里被动语态,表示“被运行了5小时”～可以直接改为主动语态,但是由于for 5 hour是持续的,所以动词不可以用瞬间动词.比如start是瞬间的,如果用start,则has started since 5 hour ago.不然还是原句比较好,如果要替换,我觉得operate应该可以
The skating marathon has been going for five hours now中going
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