There is a pair of jeans on Bill's bed.____ blue.是用They're 还是用It's要解释
问题描述：
There is a pair of jeans on Bill's bed.____ blue.是用They're 还是用It's要解释
答
用It's ,
a pair of jeans 一条裤子, 表示单数, 所以用的there is . 因此用IT 指代a pair of jeans .