【題目】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:各種可能的方法都試過了,但都證明不成功。means單復(fù)數(shù)相同，由every修飾,謂語動詞用單數(shù)形式；由none proves successful可知是過去的動作對現(xiàn)在造成的影響,用現(xiàn)在完成時；且means與try為動賓關(guān)系，用被動語態(tài)。

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