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20．Tom Sawyer had to paint the fence white．（改為否定句）
Tom Sawyerdidn'thaveto paint the fence white．

分析翻譯：湯姆•索亞必須把柵欄漆成白色．
湯姆•索亞沒必要把柵欄漆成白色．

解答答案：didn't have．句中有had，是have的過去式，因此此句是過去時，一般過去時改否定句，句中沒有be動詞，添加助動詞did+not，縮寫為didn't，同時把過去式還原動詞的原型have，故答案為didn't have．

點評本題考查的是一般過去時改否定句，句中沒有be動詞，添加助動詞did，同時把過去式還原動詞的原型．

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