—What happened to the young trees we planted?
—The trees       well, but I didn't water them.
A．might growB．needn't have grown
C．would grow D．would have grown
D
考查虛擬語氣。根據(jù)but I didn't water them可知是對過去情況的假設。應該使用情態(tài)動詞+have done; needn’t have done意為：本不需要做某事實際上卻做了；would have done本會做某事實際上烏爾未做。句意：那些樹本可以長好。但是我卻沒有澆水。
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