如题所述
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must,å¿ é¡»,ä¸å¾ä¸ ,ä¹æ¯ä¸»è§ä¸ç.ç¨åº¦æ¯should强å¤äº.we must study hard.
have to ,æ¯å®¢è§ä¸ç.ä¸å¾ä¸.Please be quiet.I have to study the book for a test tomorrow.请ä¸è¦è¯´è¯äº,æ天è¦èè¯,æå¾ç书.
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