13．Every possible meanshas been tried （try） so far．

分析 到目前為止，每一種可能的方法都被試過了．

解答 7．has been tried，句子包含時間狀語so far"到目前為止"，句子應使用現(xiàn)在完成時，其主語means"方法，方式"與try構(gòu)成被動的關系，因此使用現(xiàn)在完成時的被動語態(tài)，故答案為has been tried．

點評 對于單詞填空這種題，要分析句子意思，再從結(jié)構(gòu)上和意義上對答案進行確定．

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