The cause of the accident may never (discover) ______ in spite of the effort of

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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

解析本题考查被动语态。事故的原因与“发现”这个动作之间是被动关系，故此空应填被动态。又如：This job must be finished as soon as possible．(这项工作必须尽快完成。)

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