The pair of jeans (cost)him eighty yuan.cost用单数还是复数如何填空

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The pair of jeans (cost)him eighty yuan.cost用单数还是复数如何填空

The pair of jeans (costs)him eighty yuan.
the pair of jeans是一个整体的东西,所以看作单数
The pair of hares are white.这对野兔是白色的.
the pair of hares是两个独立地物 ,就看作复数的