一道英语语法题？ 10
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Why he entered the house and how he managed to get out of it without being seen by people _remains_____ (remain) a mystery to us all 1、前面Why he entered the house and how he managed to get out of it without being seen by people替换成that case that case remains_____ (remain) a mystery to us all 2、因为是 a mystery 所以remain用remains。别看句子长，其实很简单。
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