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Some scientists think that it will take __ of years to make robots do most work for humans.

      A. hundreds               B. hundred                C. thousand

 

【答案】

A

【解析】考查数词的用法。固定短语hundreds of“成百上千”、thousands of“成千上万”;如果前面没有具体的数字,常用复数加of结构表示不确切的数字。

 

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