这句话的时态为什么这么用呢这里有一段对话：Interviewer：what is most interesting th

这句话的时态为什么这么用呢
这里有一段对话：Interviewer：what is most interesting thing you have done recently?
student:well,i have started to play tennis,and i have been having singing lessons for a few months now too.为什么要填having singing lessons,也就是现在完成进行时呢,为什么不用现在完成时呢.我觉得叙述的这句话是表示到现在已经学了唱歌的课程,应该是完成时,可答案给的是完成进行时.