请大家帮忙看看，这个英语句子有什么问题呢？

完整的句子为

Though the young scientist had failed several times, he still kept on doing his experiments.

由于从句和主句的主语相同，所以，可以将从句的连词，主语，助动词去除，
就剩下：failed
因为是主动语态，所以，将failed变为 failing，
但是，又因为这里要表达时间的先后顺序，即 先失败，再继续实验，
所以，用时态，即完成时态，表示先发生，
所以，用 have/has failed
因为做主语，所以，用分词形式，即，having failed

正确的答案
Having failed several times,the young scientist still kept on doing his experiments.

去掉been,应该用主动语态。

Having failed several times,the young scientist still kept on doing his experiments.

=Though the young scientist had failed several times,he still kept on doing his experiments.