题目内容

Mary had promised to give me a ticket for tomorrow. She failed, ____.
A．eitherB．thoughC．butD．too
选B。
结合上下文意思我们可以知道本题表示转折关系，先排除A、D；而but为并列连词通常放在句首或句子中间起连接作用。故选B。
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