Half of the class _done most of the work.The left _rather different.A.has,is B.have,is

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Half of the class _done most of the work.The left _rather different.A.has,is B.have,is
Half of the class _done most of the work.The left _rather different.A.has,is B.have,is

Half of the class _done most of the work.The left _rather different.A.has,is B.have,is
对,把 half of the class (班里一半的学生)看成为一个整体,所以用单三形式
后面的空就显而易见了,给出的备选答案都是is
并且,the left(剩下的学生)也是一个整体,也看成单数处理