The students were all tired but of them stopped to have a restA. noneB. eachC. eitherD.

问题补充：

The students were all tired, but of them stopped to have a rest．

A. none

B. each

C. either

D. neither

答案：

(答案→)A. none

B. each

C. either

D. neither

解析：考查代词.根据前半句中的all，可知学生人数超过两个，而表示三者或三者以上中没有一个人或没有一个物用none of ……。Each 表示两者以上中的每一个，either表示两者中的任何一个。Neither表示两者的否定。故选A。