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About_______of the engineers in me company were born in the_

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About_______of the engineers in me company were born in the_________.
A.two-thirds;1970 B.two-thirds;1970s
C.two-third;1970 D.two-third;1970s
About_______of the engineers in me company were born in the_
B

考查数词。句意“公司大约三分之二的工程师出生于二十世纪七十年代。”分数的表示方法是:分基母序,即分子用基数词,分母用序数词;分子大于1时,分母用复数;排除C、D。年代的表示方法是在数字后加s,如十九世纪八十年代:1880s。故选B。