单选题 The organization had broken no rules, but ______ had it acted responsibly.
A. neither B. so C. either D. both

【正确答案】 A

【答案解析】[解析] 考查倒装句。句意：该机构没有违规，但也没有很负责任地操作。后半句为倒装句，所以A项正确。C、D可排除。使用so的前提是前面句子必须是肯定句，所以B项错。