第28题: [单项选择]--How long ______ each other before they ______ married --For about a year. A. have they known; get B. have they known; were going to get C. do they know; are going to get D. had they known; got 参考答案:D 答案解析:谈论的是过去的事情,从句用一般过去时,主句动作发生在从句动作之前,用过去完成时。
第29题: [单项选择]19岁患者,近半个月来感觉右上前牙唇面有一龋洞,遇冷热酸甜敏感,无自发痛 最适合的修复材料是 A. 银汞合金 B. 玻璃离子水门汀 C. 传统型复合树脂 D. 超微型复合树脂 E. 磷酸锌水门汀 参考答案:D 答案解析:超微型复合树脂具有光洁的表面和良好的色泽稳定性,属于可抛光性材料,广泛应用于前牙审美修复。