Every possible means , but none successful． A. has tried; has proved B. tried; proves C. has been tried; proves D. is being tried; is proved 题目和参考答案——青夏教育精英家教网—

题目内容

Every possible means ____, but none ____ successful．

A. has tried; has proved B. tried; proves

C. has been tried; proves D. is being tried; is proved

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参考范文：

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