14．I can't imagine what air we would be breathing in if we __________ anything to stop air pollution．（　　）
A．hadn't doneB．didn't doC．haven't doneD．don't do

分析 我無(wú)法想象如果我們不采取任何措施來(lái)阻止空氣污染，我們將呼吸到什么樣的空氣．

解答 B  考查虛擬語(yǔ)氣．根據(jù)語(yǔ)境：我無(wú)法想象如果我們不采取任何措施來(lái)阻止空氣污染，我們將呼吸到什么樣的空氣．可知這是對(duì)于將來(lái)語(yǔ)氣的虛擬，所以if條件句用一般過(guò)去時(shí)/were to do/should+do這三種時(shí)態(tài)，所以答案選B．

點(diǎn)評(píng) 虛擬語(yǔ)氣是高考經(jīng)常考查的內(nèi)容，也是英語(yǔ)學(xué)習(xí)中的一個(gè)難點(diǎn)．虛擬語(yǔ)氣用于表示說(shuō)話人的假想、建議或主觀愿望，所表示的假設(shè)并不是事實(shí)，而是不可能或是不大可能發(fā)生或?qū)崿F(xiàn)的，除了掌握if條件句引導(dǎo)的虛擬語(yǔ)氣之外，還要掌握一些與虛擬語(yǔ)氣有關(guān)的固定句型結(jié)構(gòu)，首先，判斷是否需要使用虛擬．其次，結(jié)合虛擬語(yǔ)氣句式，判斷需使用何種時(shí)態(tài)及句式是解題的關(guān)鍵．

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