单选题 The police had decided not to proceed with a prosecution against Irwin, ______ that it was highly unlikely that any jury in the land would wish to punish him for doing this mercy killing.
【正确答案】 B
【答案解析】解析：A项是原因状语从句，谓语为过去完成时；D项是现在分词的完成式形式。主句的时态是过去完成时，这里不用强调与主句动作时间上的先后，因此不选A、D。主句的主语(The police)是空格处分词短语的逻辑主语，因此不用被动语态形式，C项不选。本题空格处应填表示伴随状态的现在分词短语，B项正确。