 Complete the following phrase:  In 2019, in her last junior year, she first won two gold medals at the Dutch U20 championships 400 m hurdles and 400 m indoor, and added her first senior title at the national indoor competition 400 m. In June, Bol won the 400 m hurdles race at the meet in Geneva, qualifying for the Doha World Championships. In July, she confirmed herself as the continents best under-20 runner in her, since that year, signature event of the 400 m hurdles, with a gold medal at the 