参考答案

正确答案：A
解析：句意；虽然他有这个缺点，但同时他有许多优点。regardless of adj. (与of连用)不管…的；不顾…的：He says what he thinks, regardless of other people's feelings. 他怎么想就怎么说，不考虑别人的情绪。Although: conj. 虽然；尽管：although they are poor they are happy. 虽然他们很穷，但很快乐。despite: prep不管；不顾；即使：Despite the bad weather we enjoyed our holiday. 尽管天气不好，我们的假期仍过得很愉快。