【题目】__________ the program , they have to stay there for another two weeks.
A. Not completing
B. Not having completed
C. Not completed
D. Having not completed
在线课程【答案】B
【解析】考查现在分词的否定式，they和complete是主动关系，用现在分词做状语，not应放在doing/having done前，句意：没有完成计划，我们不得不再待两个星期。故选B。