About __of the teachers in our school were born in the _

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About ____of the teachers in our school were born in the ___according to a survey.
A: two-thirds;1970 B:two-thirds;1970s C:two-third;1970 D: two-third;1970s
请问各位高手我应该选什么呢?拜托大家给解释一下谢谢了.

首先第一空是分数的表达方式,表示几分之几时,分子用基数词,即one,two,three之类,分母用序数词,如first,second之类,当分子大于1时,分母的序数词应加s,即用复数
第二空,因前面有定冠词the,所以应为1970s,表示年代,20世纪70年代,在具体的年号前是不用冠词的,说在1970年,应为in 1970

About ____of the teachers in our school were born in the ___ ____of the teachers in our school are women. About _________ of the teachers in tour school were born in About ____of the workers in the factory were born in the __ About _____of the students in our class were born in the ___ About___of the teachers in their school were born in the 198 About——of the students in the school were born in the ____.A About ＿＿of the students in our class were born in the ＿＿ The teachers in our school are very About _____ of the workers in our company were born in the__ About ______ of the students in our class were born in the__ The number of the teachers in our school ( is ) about forty.