试题来源：南京大学真题2006年
【单选题】 ______ three times in a row, the boxer decided to give up fighting.
A．Because having been defeated
B．Because being defeated
C．Having been defeated
D．Having defeated
参考答案：C
网考网解析：
分词短语在句中做原因状语，并且动作发生在谓语动词decided这一动作之前，因此需用完成时态，根据句... 查看试题解析出处>>
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