15．How I wish I________ my mouth before I shouted at my mum!（　　）
A．shutB．have shutC．had shutD．would shut

分析 我多么希望在對(duì)媽媽大吼前閉嘴．

解答 答案是C．本題考查wish引導(dǎo)的賓語(yǔ)從句． wish引導(dǎo)的賓語(yǔ)從句往往用虛擬語(yǔ)氣，與現(xiàn)在事實(shí)相反的愿望用過(guò)去時(shí)，be 動(dòng)詞用were；與過(guò)去事實(shí)相反的愿望用過(guò)去完成時(shí)；與將來(lái)事實(shí)相反的愿望用could/would+do；根據(jù)本題題干中的before I shouted 可知是與過(guò)去事實(shí)相反的愿望，所以答案是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(lèi)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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