Roger's manager ________ to make him stay late if he hadn't finished the work.
句意：罗杰的经理警告他说，如果他没完成工作就必须熬夜。本题考查单词词义，warn警告，提醒；通知。insist坚持，强调。threaten威胁；恐吓。announce宣布；述说；预示。结合句意，选择B。