Half of the class ______ most of the work. Some of the work_____ really difficult.A.have done ;isB.has done ;areC.has done ;isD.have done ;are急

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Halfoftheclass______mostofthework.Someofthework_____reallydifficult.A.havedone;isB.hasdone;areC.hasd

Half of the class ______ most of the work. Some of the work_____ really difficult.A.have done ;isB.has done ;areC.has done ;isD.have done ;are急
Half of the class ______ most of the work. Some of the work_____ really difficult.
A.have done ;is
B.has done ;are
C.has done ;is
D.have done ;are

Half of the class ______ most of the work. Some of the work_____ really difficult.A.have done ;isB.has done ;areC.has done ;isD.have done ;are急
A
前面的class指的是班级同学,是复数;后面的some of the work是指整体工作的一部分,应该是单数

A.have done ;is
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a