Maryhadpromisedtogivemeaticketfortomorrow.Shefailed,

來源：國語幫 2.71W

Mary had promised to give me a ticket for tomorrow. She failed, ____.

A. either B. though C. but D. too

選B。結合上下文意思我們可以知道本題表示轉折關係，先排除A、D；而but為並列連詞通常放在句首或句子中間起連接作用。故選B。