【題目】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:你不需要擔(dān)心那個男孩,他足夠大了。根據(jù)must/need情態(tài)動詞,否定形式在后面加not,后接動詞原形,后面有to不定式,所以不能用情態(tài)動詞must/need,排除A/B;have to不得不,否定形式用don’t have to不需要;故選D。

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