题目内容
【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
【答案】B
【解析】考查现在分词完成式的否定形式，they和complete是主动关系，complete发生在have to stay there之前，因此用现在分词的完成时，not应放在doing/having done前，句意：没有完成计划，他们不得不再待两个星期。故选B。
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