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【題目】Jack does his homework every day.(改為否定句)
Jack his homework every day.

【答案】doesn't;do
【解析】陳述句中有實意動詞時,變?yōu)榉穸ň鋺趯嵙x動詞前加don't或doesn't,同時實意動詞要用原形。句子主語是第三人稱單數,應該用doesn't,然后把后面的does 還原成動詞原形,所以答案是doesn't,do。

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