Every possible means _______ to save the wounded hero up to now.
问题描述：
Every possible means _______ to save the wounded hero up to now.
Every possible means _______ to save the wounded hero up to now.
A.have tried B.has tried C.have been tried D.has been tried
答
D
every 是单数
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被动语态,动词的过去分词前要有be动词
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