I saw there__a pair of jeans on the bed when I came in.A.was B were C is D are

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I saw there__a pair of jeans on the bed when I came in.A.was B were C is D are
I saw there__a pair of jeans on the bed when I came in.A.was B were C is D are

I saw there__a pair of jeans on the bed when I came in.A.was B were C is D are
A 有a pair of的时候要看pair的单复数情况,不加s就是单数,saw过去时,所以用was