The plan is dead. I______it more water.
A.will giveB.would have givenC.must giveD.should have given在线课程D
考查虚拟语气。句意：这个计划报废了。我本来应该加更多的水。“should+have+done”意思是“本来应该做某事，而实际没做。故选D。