There are five people in the room but I know .A. both of themB. none of themC. all of the

问题补充：

There are five people in the room, but I know .

A. both of them

B. none of them

C. all of them

D. neither of them

答案：

A. both of them

(答案→)B. none of them

C. all of them

D. neither of them

解析：both表示两个都，none意思是没有人，多指三个或者三个以上；all表示三个或三个以上都；neither表示两个都不。根据题意，房间里有五个人，但是我一个也不认识。三个以上都不，故选B。