【题目】Dashan, who _________ crosstalk, the Chinese comedic tradition, for decades, wants to mix it up with the Western stand-up tradition.
A. will be learning B. is learning
C. had been learning D. has been learning
在线课程【答案】D
【解析】试题分析：考查时态。本句强调这几十年来大山一直努力把中国传统的相声和西方的脱口秀结合。所以使用现在完成进行时，强调动作的延续性和反复性。故D项正确。