Half of the class ___ most of the work,The rest ___ really difficult.

题目

Half of the class ___ most of the work,The rest ___ really difficult.
a.has done; are b.has done; is
c.have done; is d.have done; are
应该选什么 、为什么

答案

C half of the class 表示学生 复数 用have done
the rest 表示 the rest of the work 表示单数 用 is