--must be working in the office I think.Sure the light is still on.A. NobodyB. Someon

问题补充：

--must be working in the office, I think.

--Sure, the light is still on.

A. Nobody

B. Someone

C. Everyone

D. Anyone

答案：

A. Nobody

(答案→)B. Someone

C. Everyone

D. Anyone

解析：句意：我认为有人肯定在办公室工作。对，灯还亮着。A没有人B某人，有人。C每个人D任何人。故选B。