15．You       the day off from work，which created a burden for everyone else．（　�。�
A．shouldn't have takenB．mustn't have taken
C．couldn't have takenD．wouldn't have taken

分析 你本不應(yīng)該請(qǐng)假，這給其他人都帶來(lái)了負(fù)擔(dān)．

解答 答案：A 句意表達(dá)的是對(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)；shouldn't不該，mustn't不準(zhǔn)，couldn't不能，wouldn't不會(huì)；句意表達(dá)的是不應(yīng)該，含有責(zé)備的語(yǔ)氣．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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