Some scientists believe that there will be more robots in       years.

A．hundreds of B．hundred of 
C．two hundreds of D．two hundreds 

A

解析試題分析：句意為：一些科學(xué)家相信數(shù)百年后將會有更多的機器人。當hundred/thousand/million等詞前有確切數(shù)字時，hundred/thousand/million等詞后應(yīng)不加“s”，且無of；當hundred/thousand/million等詞前無確切數(shù)字時，hundred/thousand/million等詞后加“s”，且有of。根據(jù)語境可知應(yīng)選A。
考點：考查數(shù)詞的用法。

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