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

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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