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 本题考查的是谓语动词的语态。cause与discover之间是被动的关系，因此要用被动语态。情态动词may之后要用动词原形，故应填入be discovered。
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