问题补充:
—All the volunteers were very tired, but of them took a rest.
—They were busy looking for the missing people.
A. neither
B. all
C. both
D. none
答案:
A. neither
B. all
C. both
(答案→)D. none
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。