单选题 Even though the investigation has been going on for two months, the police have ______no further details about the accident.

【正确答案】 C
【答案解析】[解析] 空格所在部分的意思为：警方还没有______进一步的细节。将各选项代入，只有released“已发布；释放”符合题意，因此本题选C。