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場的，你為什么要叫出租車？

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

點評 虛擬語氣是表示與事實相反的假設(shè)，構(gòu)成方式有：對現(xiàn)在或?qū)�，條件句中用一般過去時態(tài)，主語用情態(tài)動詞加動詞原形；對過去，條件句中用過去完成時態(tài)，主語用情態(tài)動詞加完成時態(tài)．學習時，要牢記構(gòu)成方式．

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