3．But for their help，we ____ the program in time．（　　）
A．can not finishB．will not finish
C．had not finishedD．could not have finished

分析 要不是他們幫忙，我們不可能及時(shí)完成這項(xiàng)計(jì)劃．

解答 答案：D 題干表達(dá)與事實(shí)相反的假設(shè)，要用虛擬；對(duì)過(guò)去的虛擬，主句要用情態(tài)動(dòng)詞加完成時(shí)態(tài)來(lái)構(gòu)成；句中but for相當(dāng)于條件句if they hadn't helped us．故選D．

點(diǎn)評(píng) 虛擬語(yǔ)氣是表示與事實(shí)相反的假設(shè)，構(gòu)成方式有：對(duì)現(xiàn)在或?qū)?lái)，條件句中用一般過(guò)去時(shí)態(tài)，主語(yǔ)用情態(tài)動(dòng)詞加動(dòng)詞原形；對(duì)過(guò)去，條件句中用過(guò)去完成時(shí)態(tài)，主語(yǔ)用情態(tài)動(dòng)詞加完成時(shí)態(tài)．學(xué)習(xí)時(shí)，要牢記構(gòu)成方式．

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