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.
A. since they had clearly recognized B. clearly recognizing
C. clearly being recognized D. clearly having recognized

【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。