15．If I _______ that program the day before yesterday，my computer wouldn't have broken down．（　�。�
A．didn't runB．haven't runC．hadn't runD．were not to run

分析 如果前天我沒有運行那個程序，我的電腦就不會崩潰．

解答 答案是C．本題考虛擬條件句．由題干中的the day before yesterday判斷這是與過去事實相反的虛擬條件句；此時主句中用"would/should/could/might+have done"，虛擬條件句中往往用過去完成時，由此判斷答案是C．

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(dá)虛擬．

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