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【题目】Somescientiststhinkthatitmaytake_____yearstomakerobotswalk

A. hundredsofB. twohundredsofC. twohundreds D. twohundredof

【答案】A

【解析】

句意“一些科学家认为让机器人走路可能要花费成百上千年”。本题考查hundred的用法。hundred与具体数字连用时,hundred不加s,排除Chundredof连用时,要加s,但是数词与of不能同时出现,排除BD,故选A

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