问题补充:
-------How many students are there in the classroom?
------- .They are all on the playground.
A. No one
B. None
C. Nobody
D. Everyone
答案:
A. No one
(答案→)B. None
C. Nobody
D. Everyone
解析:本题的含义为在教室里有多少学生,回答语说他们都在操场上,所以没有一个在班级,表示数量上一个都没有可用none来回答,故本题选B。