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【题目】Every possible means __________, but none proves successful.

A. has tried B. has been tried

C. is being tried D. tried

【答案】B

【解析】句意:各种可能的方法都试过了,但都证明不成功。means单复数相同,由every修饰,谓语动词用单数形式;由none proves successful可知是过去的动作对现在造成的影响,用现在完成时;且means与try为动宾关系,用被动语态。

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