The cause of the accident may never______ (discover) in spite of the effort of the police.

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问题 The cause of the accident may never______ (discover) in spite of the effort of the police.

选项

答案be discovered

解析 动词的语态。情态动词后使用动词原形,又因主语与谓语是被动关系,所以本题用被动语态。
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