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_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

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。

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