2．_____ this life jacket，I _____ away by the sea and wouldn't be alive today．（　　）
A．But for； would be washed
B．But for； would have been washed
C．With； would be washed
D．With； would have been washed

分析 要不是救生衣，我將會被大海沖走，今天也不會活著了．

解答 答案是B．
本題考查的是含蓄的虛擬條件句．英語中表示條件時常常沒有連詞if，而是用otherwise、or、but、but for等形式表達條件，這種類型的虛擬語氣被稱之為含蓄的虛擬條件．本題中but for表示"要不是"，相當于一個虛擬條件句．這里要表達的意思是"要不是救生衣，我就被大海沖走了"，可見這是一個與過去事實相反的虛擬；與過去事實相反的虛擬條件句中往往用過去完成時，而主句中則用"would/should/could/might+have done"，由此判斷答案是B．

點評 在掌握虛擬語氣的規(guī)則的基礎上，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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