问题补充:
There is no . I have to write it on the blackboard with .
A. paper, chalks
B. paper, chalk
C. papers, chalks
D. papers, chalk
答案:
A. paper, chalks
(答案→)B. paper, chalk
C. papers, chalks
D. papers, chalk
解析:句意:没有纸了,我只能用粉笔在黑板上写了。Paper纸,不可数名词;chalk粉笔,不可数名词;两者都没有复数形式,故选B。