3．Simon is very regretful．If he had been more careful，he _____ such a big mistake．（　�。�
A．hasn't madeB．hadn't made
C．won't have madeD．wouldn't have made

分析 Simon很遺憾．如果他更細心一點，他就不會犯這么大的錯誤了．

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，相應(yīng)的主句中用"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 在掌握虛擬語氣的規(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(dāng)?shù)膭釉~形式表達虛擬．

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