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

分析 我多么希望在對媽媽大吼前閉嘴．

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

點評 在掌握虛擬語氣的規(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)語境，選用恰當(dāng)?shù)膭釉~形式表達虛擬．

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