of the students in our class girls.A. Three fives; isB. Three fifths; isC. Three fifth;

问题补充：

of the students in our class girls.

A. Three fives; is

B. Three fifths; is

C. Three fifth; are

D. Three fifths; are

答案：

A. Three fives; is

B. Three fifths; is

C. Three fifth; are

(答案→)D. Three fifths; are

解析：句意：我们班五分之三的学生是女生。表达分数时，分母用序数词，分子用基数词，当分子大于一时，分母要用复数加s,例如1/3, one third, 2/3 two thirds；此题中主语是复数，用are，所以选D。