D
D 考察虚拟语气。句义：这个项目计划很周详，否则会损失很多钱，根据was和转折连词or可知，是对过去事实的虚拟。故主句用should/would/could + have done的形式。由此可知，D正确。
The project was carefully planned, or a great deal of money
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