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

分析 --我的猫真肥.
--你本不该给它那么多食物.

解答 答案是C.本题考查"情态动词+have done"的结构.wouldn't have done是虚拟语气,表示"本不会…";couldn't have done 表示"不可能已经…";shouldn't have done是虚拟语气,表示"本不应做但事实上却做了";没有mustn't have done;根据句意可知,"你本不应该给她那么多食物",由此判断答案选择C.

点评 在掌握虚拟语气的规则的基础上,判断题干属于什么类型的虚拟,然后根据语境,选用恰当的动词形式表达虚拟.

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