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Some scientists believe that there will be more robots in       years.
A.hundreds ofB.hundred of
C.two hundreds ofD.two hundreds
A

试题分析:句意为:一些科学家相信数百年后将会有更多的机器人。当hundred/thousand/million等词前有确切数字时,hundred/thousand/million等词后应不加“s”,且无of;当hundred/thousand/million等词前无确切数字时,hundred/thousand/million等词后加“s”,且有of。根据语境可知应选A。
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