【题目】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
【答案】B
【解析】分数的构成为分子用基数词,分母用序数词,分子如果大于1,则分母序数词一般都用复数形式,故用排除法只能选B项。