the programme these workers have to stay there for another two weeks. A. Not completingB

问题补充：

the programme, these workers have to stay there for another two weeks.

A. Not completing

B. Not completed

C. Not having completed

D. Having not completed

答案：

A. Not completing

B. Not completed

(答案→)C. Not having completed

D. Having not completed

解析：考查分词做状语。本句中的动词complete与句子主语these workers构成主动关系，所以使用现在分词的形式，如果该动作发生在主句谓语动词之前，就使用现在分词的完成式。分词的否定式就是在前面加not。句意：因为没有完成这个计划，这些工人不得不又在那里待了两个星期。故C正确。