15．-This plane         have taken off half an hour ago．
-I'm terribly sorry，madam．（　�。�
A．mustB．couldC．shouldD．would

分析 -飛機(jī)半個(gè)小時(shí)前就應(yīng)該起飛的．
-非常抱歉，女士．

解答 答案：C
句意表達(dá)的是與事實(shí)相反的假設(shè)，should have done本該做而沒(méi)有做的事；must一定，表示推測(cè)，could能夠，should應(yīng)該，would將會(huì)；從答語(yǔ)的道歉中可以知道，飛機(jī)沒(méi)有起飛，本來(lái)應(yīng)該在半個(gè)小時(shí)前起飛的．故選C．

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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