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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大学英语三级A级

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