the program they have to stay there for another two weeks.A. Not completingB. Not having

问题补充：

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

答案：

A. Not completing

(答案→)B. Not having completed

C. Not completed

D. Having not completed

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/havingdone前，句意：没有完成计划，我们不得不再待两个星期。故选B。