3．We _________ to the airport，but why did you call a taxi？（　�。�
A．should walkB．might walk
C．could have walkedD．must have walked

分析 我們本可以步行去機(jī)場的，你為什么要叫出租車？

解答 答案：C 句意表達(dá)的是與事實(shí)相反的假設(shè)，要用虛擬；對過去事實(shí)的相反假設(shè)，要用情態(tài)動(dòng)詞加完成時(shí)態(tài)來構(gòu)成；must have done表示對過去的推測，不符合句意．故選C．

點(diǎn)評 虛擬語氣是表示與事實(shí)相反的假設(shè)，構(gòu)成方式有：對現(xiàn)在或?qū)恚瑮l件句中用一般過去時(shí)態(tài)，主語用情態(tài)動(dòng)詞加動(dòng)詞原形；對過去，條件句中用過去完成時(shí)態(tài)，主語用情態(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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