We don' have any paper.Don't use __up A.them B.it 理由

B.it paper是可数名词名词
1.纸, 墙纸
The public are requested not to throw waste paper in the park.
公众被要求不得在公园里乱扔废纸。
2.〈口〉报纸
The papers forecast clear skies tomorrow.
报纸预报明天晴天。
I asked him to fetch me the evening paper.
我请他去给我把晚报拿来。
3.文件，文献
Assemble your papers and put them in the file.
把你的文件归拢放在这个文件夹内。
4.文章，（学生的）研究报告，论文
My paper consists of ten pages.
我的论文共10页。
5.试卷；试题；答卷
The geography paper was difficult.
地理试题很难。
The teacher demands that students should turn in their test papers within two hours.
老师要求学生两小时内交卷。
6. 证明；证件

it
paper 不可数