题目内容

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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