问题补充:
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
答案:
A. Not completing
B. Not completed
(答案→)C. Not having completed
D. Having not completed
解析:句意是:没有完成计划,他们只好再呆两星期。因为是先没有完成计划,才要呆在那里。因为是先没有完成计划,然后才又待了两个星期,用现在分词的完成式,否定not放在having的前面。选C。
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