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【题目】You ______ to worry about that boy . He’s old enough .

A. mustn’tB. needn’tC. haven’tD. don’t have

【答案】D

【解析】

句意:你不需要担心那个男孩,他足够大了。根据must/need情态动词,否定形式在后面加not,后接动词原形,后面有to不定式,所以不能用情态动词must/need,排除A/Bhave to不得不,否定形式用don’t have to不需要;故选D

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