---All the volunteers were very tired, but______of them took a rest.
---They were busy looking for the missing people.A.neitherB.allC.bothD.none
网友回答
D解析Both两者都；Neither表示两者都不；all所有都；none一个也没有。句意：所有的志愿者都很累了，但是他们中没有一个人休息一下。——他们正在忙着寻找失踪的人们。结合语境可知选D。
考点：不定代词辨析