问题补充：
Some scientists think that it may take years to make robots look like people, and do the same things as us.
A. hundreds of
B. two hundreds of
C. two hundreds
D. two hundred of
答案：
(答案→)A. hundreds of
B. two hundreds of
C. two hundreds
D. two hundred of
解析：此题重点考察数量的表示方法，确切的数量德表示方法：数词+hundred/thousand/million+名复;不确切数量的表示方法是hundreds/thousands
/millions of+名词的复数形式。
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