---Have all the mysteries been cleared up?--- Almost. But ______ only one question ______A.there remains; answeredB.it remains; to be answeredC.there remains; to be answeredD.it remains; answered
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C解析试题分析：考查there be 句型及不定式作定语。句意：---所有的谜团都解开了吗？---几乎都解开了。只剩下一个还未解决。There remains…是there be句型的变形，第二空to be answered是不定式的被动做定语，表示“有待解决”，选C。考点：考查there be 句型及不定式作定语