—What happened to the young trees we planted?
—The trees well, but I didn't water them.
A. might grow
B. needn't have grown
C. would grow
D. would have grown
网友回答
A. might grow
B. needn't have grown
C. would grow
(答案→)D. would have grown
解析：考查虚拟语气。根据but I didn't water them可知是对过去情况的假设。应该使用情态动词+have done; needn’t have done意为：本不需要做某事实际上却做了；would have done本会做某事实际上乌尔未做。句意：那些树本可以长好。但是我却没有浇水。