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It may take _________ years to make such robots .        
A.hundred ofB.two hundredsC.hundreds ofD.hundred
C

试题分析:英语中数词表示概数时,后面加s,和介词of搭配使用。用原形时表示具体数字和数词搭配使用。句意:做出这样的机器人,可能还要几百年的时间。结合语境可知选C。
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