掌握have to (不得不)和do not need to(不必要)的用法

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掌握have to (不得不)和do not need to(不必要)的用法
答案要多一点

have to表示一种客观的需要,意思是“不得不”.如: I have to attend an important meeting this afternoon. 今天下午我不得不参加一个重要的会议. Mother is out,so I have to look after the shop. 妈妈不在家,因...