The project last month but unfortunately it had to be prolonged because of the financial problem.
A. needn’t have been finished
B. shouldn’t have finished
C. could have been finished
D. must have finished
网友回答
A. needn’t have been finished
B. shouldn’t have finished
(答案→)C. could have been finished
D. must have finished
解析：句意：这个项目本来是可以在上个月完成，但是不幸的是，因为财政问题，它不得不被延期。从but unfortunately it had to be prolonged because of the financial problem.可知这是对过去的虚拟，用could have done表示“本可以做却没有做”，所以选C.