About_of the students in Grade Nine this year were born in the _A.three five;1996B.three fifths;1990sC.third fifth;1997D.third fifths;1990s并说明理由

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About_ofthestudentsinGradeNinethisyearwereborninthe_A.threefive;1996B.threefifths;1990sC.thirdfifth;

About_of the students in Grade Nine this year were born in the _A.three five;1996B.three fifths;1990sC.third fifth;1997D.third fifths;1990s并说明理由
About_of the students in Grade Nine this year were born in the _
A.three five;1996
B.three fifths;1990s
C.third fifth;1997
D.third fifths;1990s
并说明理由

About_of the students in Grade Nine this year were born in the _A.three five;1996B.three fifths;1990sC.third fifth;1997D.third fifths;1990s并说明理由
选择B
解析:分子用基数词three,分母用序数词fifth,当分子大于一时,分母的序数词后面加s,故有three fifths来表达三分之五.
in + 年份
in the + 年代
对你有所帮助的话,

倒过来解析:第二个空in the__,这里表示年代,而不是年份,因为年份不加the。所以排除AC。第一个空是分数表达法,分子基数词,分母序数词,分母是复数要变。3/5嘛,three fifths,我看看是哪个。。。B了

B.three fifths;1990s
分数的表达法是:先读分子,后读分母;分子用基数词,分母用序数词;分子大于1,分母加复数。
具体的年份前不能用定冠词。