—What happened to the young trees we planted last week?
—The trees _      well, but I_        them．  
A．might grow; hadn't wateredB．needn't have grown; didn't water
C．would have grown; didn't waterD．would grow; hadn't watered
C

試題分析：考查虛擬語氣和時態(tài)的用法。句意：去年春天種樹的時候發(fā)生了什么事？這些書本可以長的很好，但是他們沒有細心照料。would have done 是對過去事情的虛擬，本可以做卻沒做，第二空根據(jù)后面使用了轉(zhuǎn)折but 來看。表示事實上沒有澆水，是過去的事實，用一般過去式，選C。
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