12． About_______ of the workers in the factory were born in the __________．
- A two- thirds;1970
- B two- thirds ; 1970s
- C two-third ; 1970
- D two-third ; 1970s
问题
12． About_______ of the workers in the
参考解析：
12．B【解析】句意：工厂里大约2/3的工人出生在20世纪70年代。分数的表达为分子用基数词，分母用序数词，如果分子大于1，则分母要用复数，排除C、D，年代的表达要在年份后加s．故选B。
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