问题
选择题
All possible means to save the wounded soldier.
A．has been tried
B．have been tried
C．is to be tried
D．are trying
答案
答案：B
means是单复数同形名词，谓语的单复数取决于句子意思，如all/those/a lot of means动词用复数；every/this/that means动词用单数。