About of the workers in the factory were born.A. two thirds in the 1970B. two thirds in t

问题补充：

About of the workers in the factory were born.

A. two thirds,in the 1970

B. two thirds,in the 1970s

C. two third,in the 1970

D. second thirds,in the 1970s

答案：

A. two thirds,in the 1970

(答案→)B. two thirds,in the 1970s

C. two third,in the 1970

D. second thirds,in the 1970s

解析：句意:在这个工厂大约三分之二的工人出生在20世纪70年代。英语中分数的表达方法是，分子用基数词，分母用序数词，当分子大于一的时候，分母加-s，故三分之二应是two thirds；in the 1970s意为在20世纪70年代，是一个固定的表达方式。故选B。