---How many students are there on the playground?-.A. NobodyB. NothingC. NoneD. None of

问题补充：

---How many students are there on the playground? ---.

A. Nobody

B. Nothing

C. None

D. None of them

答案：

A. Nobody

B. Nothing

(答案→)C. None

D. None of them

解析：none可以回答how many 来提问的句子，表示一个也没有。