题目内容：

A number of students ___the exam so far,but the number of the students who failed__great.A passed;were B.has passed;are C.have passed;is D.have passed;are

优质解答

A number of students __C_the exam so far,but the number of the students who failed__great.A passed;were B.has passed;are C.have passed;is D.have passed;are

追问：

why？

追答：

其实这个题目用排除法最简单. the number of指的是挂科学生的人数，后面跟单数，所以只能是C