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9．Lily is ill in hospital．Really？I _____ she was ill．（　　）

A．

don't know

B．

know

C．

knew

D．

didn't know

分析莉莉病了在醫院，真的？我不知道她病了．

解答答案：D．結合really？可知不知道莉莉病了，故用否定句，結合句意表達的是過去的事情故用一般過去時，故借助于did構成否定，故答案是D．

點評簡單句中含有系動詞be、情態動詞和助動詞時，變否定句時需在系動詞be、情態動詞和助動詞后加not．如：I am a teacher．→I am not a teacher．
He can help me．→?He can't help me．
簡單句中謂語動詞為行為動詞時，要根據時態選用do的相應形式，把肯定句變為否定句．如：
The little girl wants to go there．?→The little girl doesn't want to go there．

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