— How many classmates did you see there?— .A. No oneB. NoneC. NobodyD. Not at all

问题补充：

— How many classmates did you see there?

— .

A. No one

B. None

C. Nobody

D. Not at all

答案：

A. No one

(答案→)B. None

C. Nobody

D. Not at all

解析：No one和Nobody在句中常可作主语。None作主语时常和of连用，以限制范围，在范围明确的情况下也可作宾语。