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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科目：高中英語 來源： 題型：閱讀理解

5．I cheated on a unit test in math class this morning during second period with Mr Burke Afterward，I was too sick to eat lunch just thinking about it．
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