题目

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：B 解析: 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。

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