---Have all the mysteries been cleared up?
--- Almost. But ______ only one question ______.
A．there remains; answeredB．it remains; to be answered
C．there remains; to be answered D．it remains; answered
C

試題分析：考查there be 句型及不定式作定語。句意：---所有的謎團(tuán)都解開了嗎？---幾乎都解開了。只剩下一個還未解決。There remains…是there be句型的變形，第二空to be answered是不定式的被動做定語，表示“有待解決”，選C。
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