— Who is in the reading room? The lights are all on.— .A. Nothing B. NoneC. No oneD. No

问题补充：

— Who is in the reading room? The lights are all on.

— .

A. Nothing

B. None

C. No one

D. No

答案：

A. Nothing

B. None

C. No one

D. No

解析：用who 提问，回答用no one指人。 none 指数量，回答how many 的提问， nothing 回答what 的提问。

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