15．If I had been a little more careful，I _______the wallet behind．（　�。�
A．won't leaveB．hadn't left
C．didn't leaveD．wouldn't have left

分析 要是我更細心點我就不會把錢包拉下了．

解答 答案是D．本題考虛擬條件句．與過去事實相反的虛擬條件句中往往用過去完成時，主句中用"would/should/could/might+have done"；由從句中的had been判斷是與過去事實相反，由此判斷答案是D．

點評 掌握虛擬語氣的規(guī)則的基礎(chǔ)上，判斷題干屬于什么類型的虛擬，然后根據(jù)語境，選用恰當?shù)膭釉~形式表達虛擬．

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