2. 外语
  3. ________has been known for a hundred years, its commercial development has taken place since the beginning of the century.

________has been known for a hundred years, its commercial development has taken place since the beginning of the century.

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问题 ________has been known for a hundred years, its commercial development has taken place since the beginning of the century.
选项 A、Which
B、While
C、That
D、As
答案D
解析 它的商业发展始于本世纪初，已经被世人熟知一百年了。定语从句题。As作为关系代词，可以引导非限制性定语从句，指代后面的整个主句。故D项为正确答案。
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