单选题 ______ the program, they have to stay there for another two weeks.
  • A. Not completing
  • B. Not completed
  • C. Not having completed
  • D. Having not completed


【正确答案】 C
【答案解析】[考点] 非谓语动词的否定
[解析] 据题意此处强调not complete的动作发生于stay之前，故用完成形式。not放在分词前面。