Enough _____to make the streets clean.A.has been done B.have been done选哪个,why?

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Enough _____to make the streets clean.
A.has been done
B.have been done
选哪个,why?

A 为了使街道干净,已经做了够多了
enough单独做主语时,谓语用单数,这是一条语法规则.