B
三分之二的英语是two thirds（复数）
the 1970s指的是一个年代,如果是1970年的话不加冠词.
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4. About _____ of the workers in the factory were born in the _______
4. About _____ of the workers in the factory were born in the _______
A,two thirds;1970B,two thirds;1970s C,two third;1970D,two third;1970s
A,two thirds;1970B,two thirds;1970s C,two third;1970D,two third;1970s
英语人气：861 ℃时间：2019-10-17 06:15:44
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