About__of the workers in the factory were born in the___.A,two-thirds;1970B,two-thirds;1970sC,two-third;1970为什么?有连字符还需要加thirds“s”吗?

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About__of the workers in the factory were born in the___.A,two-thirds;1970B,two-thirds;1970sC,two-third;1970为什么?有连字符还需要加thirds“s”吗?
About__of the workers in the factory were born in the___.
A,two-thirds;1970
B,two-thirds;1970s
C,two-third;1970
为什么?有连字符还需要加thirds“s”吗?

About__of the workers in the factory were born in the___.A,two-thirds;1970B,two-thirds;1970sC,two-third;1970为什么?有连字符还需要加thirds“s”吗?
B
表示百分比时, 第一个数字用序数词.one two three..., 第二个数字用基数词复数, seconds, thirds, fourths... 如 two thirds 三分之二, three fourths 四分之三.
in the 1970s 表示70年代
in 1970 在1970年,不加the
thirds不需要加's