More than two _______years ago, people knew little about the universe.
A．thousandsB．thousandC．thousands ofD．thousand of
B
此題考查名詞的量。確切數(shù)量常用數(shù)詞+hundred/thousand/million/billion+名詞的復(fù)數(shù)形式；不確切數(shù)量常用hundreds/thousands/millions/billions + of+名詞的復(fù)數(shù)形式.
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