His family _______ ________ for 25 years _______they were discovered.

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His family _______ ________ for 25 years _______they were discovered.
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His family _______ ________ for 25 years _______they were discovered.
His family _______ ________ for 25 years _______they were discovered.

His family _______ ________ for 25 years _______they were discovered.
had disappeared ,until
had/has +过去动词表示过去一直持续某种动作或状态
根据句干知道句子要表达的意思是:他的家人已经失踪了25年,直到她们被找到.
根据句子意思可以断定第3空填until表示“直到”的意思.
然而第1.2空的动作根据句意可以断定发生在until之后的动作were discovered之前,即发生在过去的过去,要用had done sth.所以应该填had disappeared.

had disappeared
until