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);從答語的道歉中可以知道,飛機(jī)沒有起飛,本來應(yīng)該在半個(gè)小時(shí)前起飛的.故選C.

點(diǎn)評(píng) 虛擬語氣是表示與事實(shí)相反的假設(shè),構(gòu)成方式有:對(duì)現(xiàn)在或?qū),條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(duì)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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