All possible means__________, but not a means__________obvious effect.

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问题 All possible means__________, but not a means__________obvious effect.

选项 A、have been tried; has
B、have tried; has
C、has been tried; have
D、have been tried; have

答案A

解析 当means作“方法,手段”讲时,单复数同形,若其前面有each,every,either,neither 等表示单数概念的定语时,谓语动词用单数形式;若有all,both,these 等表示复数概念的定语时,谓语动词用复数形式。根据句意可知,means和ay之间为逻辑上.的动宾关系,所以应用被动语态,故第一个空应填have been tried。逗号后面的means强调的是“一种方法”,表示单数含义,所以第二个空应填has。赦选A。
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本试题收录于: 英语题库普高专升本分类
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