The walls look clean.They____?A.needn't painted B.don't need paintedc.needn't to be painted D.don't need painting请说明理由

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The walls look clean.They____?A.needn't painted B.don't need paintedc.needn't to be painted D.don't need painting请说明理由
The walls look clean.They____?
A.needn't painted B.don't need painted
c.needn't to be painted D.don't need painting
请说明理由

The walls look clean.They____?A.needn't painted B.don't need paintedc.needn't to be painted D.don't need painting请说明理由
D.don't need painting
need作行为动词是don't need to do
need作情态动词是needn't do
need doing =need to be done
因为是被动,所以need painting

d,sth needs doing/to be done

D
need可以作情态动词,也可以作普通的行为动词
当作为情态动词时,应该needn't be painted
当作为非情态动词时,应该don't need to be painted
而to be paint可以写成painting