20．Why didn't you tell me there was no meeting today？I _____ all the way here through the heavy snow．（　�。�
A．needn't have drivenB．can't have driven
C．mustn't have drivenD．shouldn't have driven

分析 為什么你不告訴我今天不開(kāi)會(huì)？那樣我就不必冒著大雪開(kāi)車來(lái)這了．

解答 答案：A 題干表達(dá)的是與事實(shí)相反的假設(shè)，要用虛擬；對(duì)過(guò)去事實(shí)的相反假設(shè)，要用情態(tài)動(dòng)詞加完成時(shí)態(tài)來(lái)構(gòu)成；mustn't和can't不能用來(lái)構(gòu)成虛擬；shouldn't本不應(yīng)該，不符合句意．故選A．

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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