Some scientists think that it may take ______years to make robots look like people,  and do the same things as us.
A．hundreds ofB．two hundreds of
C．two hundredsD．two hundred of
A
此題重點考察數(shù)量的表示方法，確切的數(shù)量德表示方法：數(shù)詞+hundred/thousand/million+名復;不確切數(shù)量的表示方法是hundreds/thousands
/millions of+名詞的復數(shù)形式。
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