this pair of trousers cost you a lot,_____? A.don't they B.didn't itC.doesn't it d.don't they

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this pair of trousers cost you a lot,_____? A.don't they B.didn't itC.doesn't it d.don't they
this pair of trousers cost you a lot,_____? A.don't they B.didn't itC.doesn't it d.don't they

this pair of trousers cost you a lot,_____? A.don't they B.didn't itC.doesn't it d.don't they
选B
因为主语this pair是单数的,而谓语用了cost,若是一般现在时的话则要加上s,故推断它是过去式,所以用didn't it

A、D

B