◎ 题干
One of the reasons        Billy Crystal has become so famous is _______ his outstanding ability to
improvise(即兴创作).  
[     ]
A. that; that
B. why,/
C. why,that
D. because,  /
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“One of the reasonsBilly Crystal has become so famous is _______ his outstanding ability toimprovise(即兴创作).[ ]A. that; thatB. why,/C. why,thatD. becaus…”主要考查了你对  【关系代词】【限制性定语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。