【题目】________ 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
在线课程【答案】C
【解析】
试题考查现在分词的完成式做状语，因为他们是先没有完成任务，然后不得不在这儿再待两个星期。表示从句的动作先于主句的动作，要用现在分词的完成式，否定式是：not having done。选C。