【题目】About ________ of the students are from foreign countries.
A.three four
B.three fourth
C.third fourth
D.three fourths

【答案】D
【解析】句意：大约四分之三的学生是外国人。表达分数时，分子用基数词，分母用序数词，分子大于1分母用复数，故选D。