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)該請假,這給其他人都帶來了負(fù)擔(dān).

解答 答案:A 句意表達(dá)的是對過去事實(shí)的相反假設(shè),要用情態(tài)動詞加完成時態(tài);shouldn't不該,mustn't不準(zhǔn),couldn't不能,wouldn't不會;句意表達(dá)的是不應(yīng)該,含有責(zé)備的語氣.故選A.

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),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(xué)習(xí)時,要牢記構(gòu)成方式.

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