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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 你本不應該請假，這給其他人都帶來了負擔．

解答 答案：A 句意表達的是對過去事實的相反假設，要用情態動詞加完成時態；shouldn't不該，mustn't不準，couldn't不能，wouldn't不會；句意表達的是不應該，含有責備的語氣．故選A．

點評 虛擬語氣是表示與事實相反的假設，構成方式有：對現在或將來，條件句中用一般過去時態，主語用情態動詞加動詞原形；對過去，條件句中用過去完成時態，主語用情態動詞加完成時態．學習時，要牢記構成方式．

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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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