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【题目】All possible means ________ tried, but not every means ________.

A.have been; workB.has been; worksC.have been; worksD.has been; work

【答案】C

【解析】

考查主谓一致。句意:所有可能的方法都试过了,但不是所有的方法都有效。第一空有all来修饰means,所以谓语动词用复数形式;第二个空有every修饰means,所以用单数。故选C

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