2．--My cat's really fat．
--You ______ have given her so much food．（　　）
A．wouldn'tB．couldn'tC．shouldn'tD．mustn't

分析 --我的貓真肥．
--你本不該給它那么多食物．

解答 答案是C．本題考查"情態(tài)動(dòng)詞+have done"的結(jié)構(gòu)．wouldn't have done是虛擬語(yǔ)氣，表示"本不會(huì)…"；couldn't have done 表示"不可能已經(jīng)…"；shouldn't have done是虛擬語(yǔ)氣，表示"本不應(yīng)做但事實(shí)上卻做了"；沒(méi)有mustn't have done；根據(jù)句意可知，"你本不應(yīng)該給她那么多食物"，由此判斷答案選擇C．

點(diǎn)評(píng) 在掌握虛擬語(yǔ)氣的規(guī)則的基礎(chǔ)上，判斷題干屬于什么類型的虛擬，然后根據(jù)語(yǔ)境，選用恰當(dāng)?shù)膭?dòng)詞形式表達(dá)虛擬．

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