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19.He has to finish the work first everyday.(否定句)
Hedoesn't have to finish the work first everyday.

分析 他每天都必须先完成作业、
他没有必要每天先完成作业、

解答 答案:doesn't have.结合has to是一般现在时,借助于does构成否定句,后加动词原形have,故答案是doesn't have.

点评 含有be动词,情态动词或者助动词have/has的句子转化成否定时在其后面加上not,一般实意动词的否定式,通常应根据不同时态和人称在实意动词之前加don't,doesn't,didn't等.

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