1 are
upstairs是形容词,前面需要动词,而且是连系动词,形容词作表语,children是复数,用are
2 have
sheep单复数同形,但可以从these看出这里是复数,因此不能用谓语的三单形式（has是错的）,羊有一身长毛,拥有的有动词形式是have
The children upstairs a.is b.are c.do d.have These sheep lon
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