18．---What happened to the young trees we planted last week？
---The trees___well，but I didn't water them．（　　）
A．might growB．would grow
C．needn't have grownD．would have grown

分析 --上周我們種植的年幼的樹怎么了？
--這些樹本來長得挺好的，但是我沒有給他們澆水．

解答 答案：D．
根據(jù)but后面的句子是一個過去的事實(shí)可知，前面的句子應(yīng)該是對這些樹的狀況的猜測；是對過去事實(shí)的假設(shè)，所以使用would have done；故選D．

點(diǎn)評 本題考查虛擬語氣，要掌握與過去，現(xiàn)在，將來虛擬時的句型結(jié)構(gòu)并結(jié)構(gòu)具體的語境選擇出正確的答案．

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