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【题目】He had to walk to school last year.(改为否定句)

He________ ________ to walk to school last year.

【答案】didn’t have

【解析】

句意:去年,他不得不步行去上学。

根据原句是一个含有实义动词的过去式的句子。变为否定句时,要借助助动词didn’t,因为didn’t已经代表是过去发生的事情,其后要用动词原形,要用had的原形have。故答案为didn’t have

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