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

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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

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
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

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
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

C (CLASS 是集合名词,在这儿指班上的一半同学做了大部分的工作,剩余的真的很难’THE REST 作为一个整体,故用单数)