Question

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

A. has tried B. has been tried

C. is being tried D. tried

Answer 1

【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。