题目内容

Every year, _____ people go to visit their factory
A．a thousand of B．thousands
C．thousand ofD．thousands of
D

试题分析：句意：每一年都有成千上万的人们去参观他们的工厂。thousands of成千上万，不确定的所指，故选D
点评：单位数量词，表示确定所指时不加s,不加of；表不确定所指时加s,加of，这是相对于后面直接接名词来讲的，而本题中of存在所属关系，所以要特别注意区分，而诸如这种情况就要加，如：hundreds of people.
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