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Every possible means ______ but no one knows which is suitable.
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A. has discussed
B. have been discussed
C. has been discussed
D. were discussed
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根据n多题专家分析，试题“Every possible means ______ but no one knows which is suitable. [ ]A. has discussed B. have been discussed C. has been discussed D. were discussed …”主要考查了你对 【现在完成时的被动语态】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
与“Every possible means ______ but no one knows which is suitable. [ ]A. has discussed B. have been discussed C. has been discussed D. were discussed ”考查相似的试题有：
