12.He mustn't have kept a healthy diet because he is overweight.

分析 他不可能保持健康飲食,因?yàn)樗亓耍?/p>

解答 mustn't改為can't.
根據(jù)句意可知此處表達(dá)的意思是"他不可能保持健康飲食",沒(méi)有mustn't have done這種表達(dá)方式,要想表示"不可能已經(jīng)…",要用can't have done表示對(duì)過(guò)去事實(shí)的否定推測(cè),因此mustn't改為can't.

點(diǎn)評(píng) 本題考查情態(tài)動(dòng)詞的誤用.這類(lèi)錯(cuò)誤是高考短文改錯(cuò)中常出現(xiàn)的情況,要求考生熟練掌握基本的句法知識(shí)做題時(shí)要認(rèn)真讀題,并結(jié)合句意及語(yǔ)境做出正確的判斷

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