题目内容：

English Help quickly!
Half of the class__most of the work.The rest____really difficult.
A.have done;is
B.has done;are
C.has;is
D.have done;are
为社么选A is?

优质解答

因为前面的have done 的主语是half of the class,班级一半的人,所用复数,后面说的是the rest of the work,所以用is,要分清楚主语到底是什么.