–How many students are there in the classroom?. They are all in the lab.A. SomeB. None

问题补充：

–How many students are there in the classroom?

--. They are all in the lab.

A. Some

B. None

C. All

D. Neither

答案：

A. Some

(答案→)B. None

C. All

D. Neither

解析：本题的问句是问有多少学生在教室里？回答语表示都在实验室，都不在班级，表示三个或三个以上一个也没有，通常用none来表示，故本题选B。