Without his help, the reason of the accident may never (discover) ______be disco

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问题 Without his help, the reason of the accident may never (discover) ______

选项

答案 be discovered

解析 本句中,主语reason和谓语discover之间是被动关系,因此应使用被动语态,其形式为系动词be+动词过去分词。又因为may等情态动词后要求加上动词原形,因此应使用系动词原形,故填入be discovered。
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