【正确答案】 D

【答案解析】manage to do sth．意思为“设法成功地做某事”。如：In spite of these insults，she man- aged to keep her temper．她虽然受到侮辱，但还是克制自己的怒气。succeed后跟in doing sth.，该短语意为“成功地做某事”。如：They succeeded in passing the exam．他们成功地通过了考试。have to表示“不得不”。如：He is so rich that be doesn't have to work．他很富有，不必工作。